What is the home position on an AZERTY keyboard?
The home position (or base position) is the starting point for everything. Your index fingers rest on the F and J keys — you can find them by the small raised bumps. Left hand: pinky on Q, ring finger on S, middle finger on D, index on F. Right hand: index on J, middle on K, ring on L, pinky on M. Thumbs rest on the space bar.
Which finger for which key?
Each finger manages a vertical column of keys. The left pinky covers A, Q, W and the keys to the left. The left ring finger covers Z, S, X. The left middle finger covers E, D, C. The left index covers R, F, V and also T, G, B (the center columns). On the right side, it's the mirror: right index covers Y, H, N and U, J. Right middle covers I, K. Right ring covers O, L. Right pinky covers P, M and punctuation.
How to memorize positions quickly?
Start with the home row (Q-S-D-F / J-K-L-M) and type simple sequences like "fj fj fj" until it becomes automatic. Then add the top row (A-Z-E-R / U-I-O-P), and finally the bottom row (W-X-C-V / B-N). Only move to the next row when the previous one is fluid. This is exactly the path proposed in Expert Dactylo.
Should you return to home position after each key?
Yes, at first. Your fingers should always return to F and J after each keystroke. Over time, this return becomes automatic and imperceptible. This is what distinguishes an efficient typist: their hands barely move.