Qt5 tutorial
Advanced Services – Qt
Advanced Services – Basic Qt

YouTube

Qt Tutorials For Beginners

Signals, Slots, Threads

How Qt Signals and Slots Work
How Qt Signals and Slots Work – Part 2 – Qt5 New Syntax
How Qt Signals and Slots Work – Part 3 – Queued and Inter Thread Connections
QMetaType knows your types
QThread: You were not doing so wrong.
Introduction to Lock-free Programming with C++ and Qt
Internals of QMutex in Qt 5
QWaitCondition: Solving the Unavoidable Race

Data initialization in C++
Can Qt’s moc be replaced by C++ reflection?
Verdigris: Qt without moc

QString

Ignore unused args in QString::arg

QMainWindow

Auto resizing qt application. (main window)
Qt: Set size of QMainWindow
How to add a custom widget to the main window in Qt Creator

QToolBar

Menus and toolbars in Qt5
QToolBar position (How to make it stay at a fixed position)
Add a QLineEdit to a qtoolbar in qtcreator (designer)

Icons

Setting the Application Icon
Create ico files (Windows Icons) – GIMP 2.8 Tutorial
How to set application icon in a Qt-based project?
QIcon::fromTheme uses GTK+’s icon cache in Qt 5.7
Yet another new set of Qt icons

Convert PNG to ICNS on Mac OS
How to manually create icns files using iconutil?
Application Icon not shown in Mac OS X Dock
cmake: set icon for a Mac OS X app
Setting the application icon for OSX in Qt Creator

Layout

Spacing and Margin

Qt Tutorial: Unit 7, Margin and Spacing
Adjust Spacing and Margins between Widgets in Layout
Set fixed margin/spacing/padding between Widgets/Layouts

Stylesheet

Customizing Qt Widgets Using Style Sheets

Button

Difference between QPushButton and QToolButton

Splitter

Customize QSplitter handle color
QSplitter – change the color of the grabbable area to make it more visible