Learn partforge
A short series, in order. Start at the top if you are new.

Lesson 1 · 4 min read
Describing a part so it comes out right
You do not have to get everything into the first message. What to say first, what the panel on the right is for, and how to point at the thing you mean.

Lesson 2 · 4 min read
Pointing at it, and drawing on it
Two ways to say something a sentence cannot: click the exact spot you mean, or draw straight on the model. Neither has to be neat.

Lesson 3 · 4 min read
Measuring it, and looking inside
The ruler and the cutaway answer most “is that actually right?” questions in about ten seconds — and anything you keep checking can become a control you can just set.