Brush Tool Not Working in Illustrator (Reasons & Fixes)

Live Paint Bucket / Fill tool not working within c - Adobe Community - 12463498

Fixing Alignment Issues in Adobe Illustrator

Brush not working properly - CLIP STUDIO ASK

Solved: Brush Definition won't stay basic - Adobe Community - 10767069

Solved: Uneven curved lines using brush tool? - Adobe Community - 9644633

Solved: Width Tool Problem - Adobe Community - 9893451

Top 5 Adobe Illustrator bug fixes for newbies, by Carolyn Wang

Brushes and Tools - Concepts for iOS Manual - Concepts App • Infinite, Flexible Sketching

Using the Blob Brush in Illustrator