How can I combine several codes?

I am interested in incorporating some code features.
For example, I want it to be – a certain skin (style), I want it to be activated automatically, and I want it to be repeated at the end of the session (loop), and maybe other things.
When I try to enter more than one code I’m not sure I can execute the second code. Is there a solution to enter more than one code?
post Scriptum. All the codes I mention refer to the codes you provide yourself, within the edit of your ‘short code’.
Would appreciate help