12-bar blues is only three chords and is a great place from which to start. Blues scale or mixo-blues scale over the top makes a great foundation and leads a long way. The fact that it has only three chords both reinforces Woodie's and Bob's statement, but the use of those scales over the chords also builds lots of other chords on the way, which we don't necessarily thinkof as chords, but they certainly are!

I'm mostly jazz-oriented, but I still enjoy improvising over simple blues progressions. A good way to switch the mind off and just let the music guide the subconcious.

I seem to remember Mark Knopfler saying that he was at his happiest just playing chords and singing along.

Jazz relative beginner, starting at a much older age than was helpful.
AVL:MXE Linux; Windows 11
BIAB2025 Audiophile, a bunch of other software.
Kawai MP6, Ui24R, Focusrite Saffire Pro40 and Scarletts
.