Beginner Exercise 1 - Your first combo
To get you used to combos, almost every character in the game has a universal basic combo. It's simply L > M > 2H > SD > j.L > j.L > j.L. This is a simple but useful combo that's perfect for practising our learning process.
Jump into training mode with Goku and make sure the AI's block state is set to "After first hit".
The 2 natural segments we can break this down into are both before and after the super dash.
Practice the sequence of L M 2H slowly until it feels natural
Work your way up to hitting them as fast as you can.
Follow up this string with a super dash and repeat until comfortable
Add the final j.L > j.L > j.L and you should have a full combo
Swap sides with your opponent and practice some more