Add several relations of the same module

Hello, I want to relate several opportunities within the lead module.
Should I create the relationship from the lead module or one to many?
I am not very clear how to make this relationship.

you can simply add a 1:n relation. Go to the studio -> leads -> relationships, there add a 1:n (or o:m) relationship to the opportunities (so that it reads basically “one lead can have many (=n) opportunities”).

The leads module will then be having a new subpanel (showing related opportunities) and within the opportunity, you have a new field that you can add to the layout (the related lead).