Answers that I frequently refer to:

• How does accepting an answer work?
• How can I search for Delphi documentation?
• How to return text from Native (C++) code
• How can I allow a form to accept file dropping without handling Windows messages?
• TLabel and TGroupbox Captions Flicker on Resize
• How do I make my GUI behave well when Windows font scaling is greater than 100%
• Buffered files (for faster disk access)
• TProgressBar never fills up all the way - seems to be updating too fast?
• Why should I not use "if Assigned()" before accessing objects?
• Control enumerators to turn recursive parent/child walking into simple for/in loops
• Undefined behavior and sequence points
• Reduce exe file
• How can I make a form that is not disabled when another form is shown modally?
• How can I stop my application showing on the taskbar?
• Simply code hooking
• Consumer thread / blocking queue
• How to do one-way hashing of an ASCII string using standard functions of Delphi?

Other useful resources:

• Rob Kennedy's What is the exact value of a floating-point variable?
• Launching an interactive process from Windows Service in Windows Vista and later
• Teach Your Apps To Play Nicely With Windows Vista User Account Control
• Window Features
• Short, Self Contained, Correct (Compilable), Example
• Raymond Chen's epic series on modality