Trans voice training, explained.
The lessons from the Trans Voice Coach app, free to read. Seven parts of a voice, in the order the course teaches them: resonance first, because it does more than pitch for how a voice is heard, and pitch third, because chasing it alone is the most common way people strain.
Each guide has the moves to try and how you'll know they're working. Reading is the easy part; the change comes from a little practice most days.

The parts of a voice
Practical
Reading it is one thing. Ten minutes a day is the rest.
Trans Voice Coach turns these guides into ten minutes of practice a day: one exercise at a time, in order, with the next one ready when you are. Free, no account, and your voice never leaves your phone.