diff --git a/launcher/core/include/launchercore.h b/launcher/core/include/launchercore.h
index 1495acc..5d78f6a 100755
--- a/launcher/core/include/launchercore.h
+++ b/launcher/core/include/launchercore.h
@@ -55,11 +55,11 @@ public:
     physis_Repositories repositories;
     const char* bootVersion;
 
-    bool isGameInstalled() const {
+    [[nodiscard]] bool isGameInstalled() const {
         return repositories.repositories_count > 0;
     }
 
-    bool isWineInstalled() const {
+    [[nodiscard]] bool isWineInstalled() const {
         return !wineVersion.isEmpty();
     }
 
@@ -102,12 +102,12 @@ public:
     /*
      * Sets a value in the keychain. This function is asynchronous.
      */
-    void setKeychainValue(QString key, QString value);
+    void setKeychainValue(const QString& key, const QString& value) const;
 
     /*
      * Retrieves a value from the keychain. This function is synchronous.
      */
-    QString getKeychainValue(QString key);
+    QString getKeychainValue(const QString& key) const;
 };
 
 struct AppSettings {
@@ -142,7 +142,7 @@ class LauncherCore : public QObject {
     Q_OBJECT
     Q_PROPERTY(SquareBoot* squareBoot MEMBER squareBoot)
 public:
-    LauncherCore(bool isSteam);
+    explicit LauncherCore(bool isSteam);
 
     // used for qml only, TODO: move this to a dedicated factory
     Q_INVOKABLE LoginInformation* createNewLoginInfo() {
@@ -159,7 +159,7 @@ public:
     }
 
     int getProfileIndex(const QString& name);
-    Q_INVOKABLE QList<QString> profileList() const;
+    Q_INVOKABLE [[nodiscard]] QList<QString> profileList() const;
     int addProfile();
     int deleteProfile(const QString& name);
 
diff --git a/launcher/core/include/patcher.h b/launcher/core/include/patcher.h
index 777d0f1..d48473c 100644
--- a/launcher/core/include/patcher.h
+++ b/launcher/core/include/patcher.h
@@ -13,7 +13,7 @@ public:
     Patcher(QString baseDirectory, GameData* game_data);
     Patcher(QString baseDirectory, BootData* game_data);
 
-    void processPatchList(QNetworkAccessManager& mgr, QString patchList);
+    void processPatchList(QNetworkAccessManager& mgr, const QString& patchList);
 
 signals:
     void done();
@@ -21,7 +21,7 @@ signals:
 private:
     void checkIfDone();
 
-    bool isBoot() const {
+    [[nodiscard]] bool isBoot() const {
         return boot_data != nullptr;
     }
 
diff --git a/launcher/core/include/steamapi.h b/launcher/core/include/steamapi.h
index 7526c29..efaac31 100644
--- a/launcher/core/include/steamapi.h
+++ b/launcher/core/include/steamapi.h
@@ -8,7 +8,7 @@ public:
 
     void setLauncherMode(bool isLauncher);
 
-    bool isDeck() const;
+    [[nodiscard]] bool isDeck() const;
 
 private:
     LauncherCore& core;
diff --git a/launcher/core/src/launchercore.cpp b/launcher/core/src/launchercore.cpp
index d4460bf..ff37152 100755
--- a/launcher/core/src/launchercore.cpp
+++ b/launcher/core/src/launchercore.cpp
@@ -3,7 +3,6 @@
 #include <QDir>
 #include <QFormLayout>
 #include <QJsonDocument>
-#include <QJsonObject>
 #include <QLineEdit>
 #include <QMenuBar>
 #include <QNetworkAccessManager>
@@ -647,7 +646,7 @@ QString LauncherCore::getDefaultGamePath() {
 void LauncherCore::addRegistryKey(const ProfileSettings& settings, QString key, QString value, QString data) {
     auto process = new QProcess(this);
     process->setProcessEnvironment(QProcessEnvironment::systemEnvironment());
-    launchExecutable(settings, process, {"reg", "add", std::move(key), "/v", value, "/d", data, "/f"}, false, false);
+    launchExecutable(settings, process, {"reg", "add", std::move(key), "/v", std::move(value), "/d", std::move(data), "/f"}, false, false);
 }
 
 void LauncherCore::readGameData(ProfileSettings& profile) {
@@ -698,14 +697,14 @@ bool LauncherCore::autoLogin(ProfileSettings& profile) {
     return true;
 }
 
-void ProfileSettings::setKeychainValue(QString key, QString value) {
+void ProfileSettings::setKeychainValue(const QString& key, const QString& value) const {
     auto job = new QKeychain::WritePasswordJob("Astra");
     job->setTextData(value);
     job->setKey(name + "-" + key);
     job->start();
 }
 
-QString ProfileSettings::getKeychainValue(QString key) {
+QString ProfileSettings::getKeychainValue(const QString& key) const {
     auto loop = new QEventLoop();
 
     auto job = new QKeychain::ReadPasswordJob("Astra");
diff --git a/launcher/core/src/patcher.cpp b/launcher/core/src/patcher.cpp
index bf3359f..add3a41 100644
--- a/launcher/core/src/patcher.cpp
+++ b/launcher/core/src/patcher.cpp
@@ -5,22 +5,23 @@
 #include <QNetworkRequest>
 #include <QStandardPaths>
 #include <physis.hpp>
+#include <utility>
 
-Patcher::Patcher(QString baseDirectory, BootData* boot_data) : boot_data(boot_data), baseDirectory(baseDirectory) {
+Patcher::Patcher(QString baseDirectory, BootData* boot_data) : boot_data(boot_data), baseDirectory(std::move(baseDirectory)) {
     dialog = new QProgressDialog();
     dialog->setLabelText("Checking the FINAL FANTASY XIV Updater/Launcher version.");
 
     dialog->show();
 }
 
-Patcher::Patcher(QString baseDirectory, GameData* game_data) : game_data(game_data), baseDirectory(baseDirectory) {
+Patcher::Patcher(QString baseDirectory, GameData* game_data) : game_data(game_data), baseDirectory(std::move(baseDirectory)) {
     dialog = new QProgressDialog();
     dialog->setLabelText("Checking the FINAL FANTASY XIV Game version.");
 
     dialog->show();
 }
 
-void Patcher::processPatchList(QNetworkAccessManager& mgr, QString patchList) {
+void Patcher::processPatchList(QNetworkAccessManager& mgr, const QString& patchList) {
     if (patchList.isEmpty()) {
         dialog->hide();
 
diff --git a/launcher/core/src/steamapi.cpp b/launcher/core/src/steamapi.cpp
index 8b564f7..0b6569e 100644
--- a/launcher/core/src/steamapi.cpp
+++ b/launcher/core/src/steamapi.cpp
@@ -1,8 +1,6 @@
 #include "steamapi.h"
 #include "launchercore.h"
 
-#include <QtGlobal>
-
 #ifdef ENABLE_STEAM
 #include <steam/steam_api.h>
 #endif
diff --git a/launcher/desktop/include/desktopinterface.h b/launcher/desktop/include/desktopinterface.h
index c1d3e67..9506c5a 100644
--- a/launcher/desktop/include/desktopinterface.h
+++ b/launcher/desktop/include/desktopinterface.h
@@ -9,7 +9,7 @@
  */
 class DesktopInterface {
 public:
-    DesktopInterface(LauncherCore& core);
+    explicit DesktopInterface(LauncherCore& core);
 
 private:
     LauncherWindow* window = nullptr;
diff --git a/launcher/desktop/include/launcherwindow.h b/launcher/desktop/include/launcherwindow.h
index 58cf6ab..0679689 100644
--- a/launcher/desktop/include/launcherwindow.h
+++ b/launcher/desktop/include/launcherwindow.h
@@ -15,7 +15,7 @@
 class LauncherWindow : public QMainWindow {
     Q_OBJECT
 public:
-    explicit LauncherWindow(LauncherCore& core, QWidget* parent = nullptr);
+    explicit LauncherWindow(LauncherCore& new_headline, QWidget* parent = nullptr);
 
     ProfileSettings& currentProfile();
 
diff --git a/launcher/desktop/src/autologinwindow.cpp b/launcher/desktop/src/autologinwindow.cpp
index 532f4d7..9ff906b 100644
--- a/launcher/desktop/src/autologinwindow.cpp
+++ b/launcher/desktop/src/autologinwindow.cpp
@@ -3,7 +3,6 @@
 #include <QDesktopServices>
 #include <QFormLayout>
 #include <QLabel>
-#include <QMessageBox>
 #include <QPushButton>
 #include <QSpinBox>
 #include <QToolTip>
diff --git a/launcher/desktop/src/bannerwidget.cpp b/launcher/desktop/src/bannerwidget.cpp
index da12a38..65deafc 100644
--- a/launcher/desktop/src/bannerwidget.cpp
+++ b/launcher/desktop/src/bannerwidget.cpp
@@ -2,6 +2,7 @@
 
 #include <QDebug>
 #include <QDesktopServices>
+#include <utility>
 
 BannerWidget::BannerWidget() : QLabel() {
     setCursor(Qt::CursorShape::PointingHandCursor);
@@ -13,5 +14,5 @@ void BannerWidget::mousePressEvent(QMouseEvent* event) {
 }
 
 void BannerWidget::setUrl(QUrl newUrl) {
-    this->url = newUrl;
+    this->url = std::move(newUrl);
 }
diff --git a/launcher/desktop/src/gamescopesettingswindow.cpp b/launcher/desktop/src/gamescopesettingswindow.cpp
index c9a2f9a..2c836f7 100644
--- a/launcher/desktop/src/gamescopesettingswindow.cpp
+++ b/launcher/desktop/src/gamescopesettingswindow.cpp
@@ -8,7 +8,6 @@
 #include <QToolTip>
 
 #include "launchercore.h"
-#include "launcherwindow.h"
 
 GamescopeSettingsWindow::GamescopeSettingsWindow(ProfileSettings& settings, LauncherCore& core, QWidget* parent)
     : QDialog(parent) {
diff --git a/launcher/desktop/src/launcherwindow.cpp b/launcher/desktop/src/launcherwindow.cpp
index 1c93fa6..b9a25b0 100644
--- a/launcher/desktop/src/launcherwindow.cpp
+++ b/launcher/desktop/src/launcherwindow.cpp
@@ -10,6 +10,7 @@
 #include <QScrollBar>
 #include <QTimer>
 #include <QTreeWidgetItem>
+#include <utility>
 
 #include "aboutwindow.h"
 #include "assetupdater.h"
@@ -325,8 +326,8 @@ LauncherWindow::LauncherWindow(LauncherCore& core, QWidget* parent) : QMainWindo
             QCoreApplication::quit();
     });
 
-    getHeadline(core, [&](Headline headline) {
-        this->headline = headline;
+    getHeadline(core, [&](Headline new_headline) {
+        this->headline = std::move(new_headline);
         reloadNews();
     });
 
diff --git a/launcher/main.cpp b/launcher/main.cpp
index c8f8e7a..5ee151b 100755
--- a/launcher/main.cpp
+++ b/launcher/main.cpp
@@ -2,7 +2,6 @@
 
 #include <QApplication>
 #include <QCommandLineParser>
-#include <QDir>
 
 #include "../launcher/tablet/include/tabletinterface.h"
 #include "cmdinterface.h"
@@ -87,5 +86,5 @@ int main(int argc, char* argv[]) {
 #endif
     }
 
-    return app.exec();
+    return QApplication::exec();
 }
diff --git a/launcher/tablet/include/tabletinterface.h b/launcher/tablet/include/tabletinterface.h
index e8f5187..bb429d4 100644
--- a/launcher/tablet/include/tabletinterface.h
+++ b/launcher/tablet/include/tabletinterface.h
@@ -10,7 +10,7 @@
  */
 class TabletInterface {
 public:
-    TabletInterface(LauncherCore& core);
+    explicit TabletInterface(LauncherCore& core);
 
 private:
     QQmlApplicationEngine* applicationEngine = nullptr;