Is there a way to add slow motion to certain areas?

Hi! I’m not sure if this is the correct place to ask this, but I was wondering if it is possible to add slow motion to specific areas of an animation.
I tried just scaling the keyframes and stuff, but I’m bad at the graph editor, and I don’t just want to linearize everything.
Also, if there is a way to change the speed without interfering with the graph editor, is there a way to sync the speed with sound?
Thanks in advance!

Do it in Blenders Video Editor. Watch tutorials on the youtube how to do it if you dont know

Ok, thanks. But wouldnt that require dropping frames?