How to manage iPhotos library

Depends on what you mean.

Which kind of library do you mean?

• a library from the old program "iPhoto" (with NO S on the end)

OR

• a library from the newer program "Photos" (with NO I on the front)

What version of macOS do you have on your MacBook Pro?

What sort of management did you have in mind?

iPhotos was the precursor to Photos. Do you have a library left over from that app? Or is this simply a typo? And what do you mean by "manage"?