soo, can someone help me with multiplication? how do you add multiple digits if that makes sense? thx alot. also, please explain if you can

https://www.mathsisfun.com/numbers/index.html

Scroll down to Multiplication, and read and study all about multiplication.

You can also go to Khan Academy to learn many different subjects.
https://www.khanacademy.org/math/cc-fourth-grade-math/cc-4th-mult-div-topic