Somebody help me! At the beginning of the SM when we go to get the first missiles, there are those stones, like I do to shoot down and fall to the right at the same time? Excuse me so many questions i'm starting to run now.

The fastest strat for that room uses a Downback: while firing those two shots to clear the blocks in the way: https://wiki.supermetroid.run/Hitbox_Manipulation#Downback

Here's the room page, though we don't have a separate video for that strat at the moment: https://wiki.supermetroid.run/Construction_Zone

Thanks a lot for the help