[PnP] how to resolve skill checks?

[Catacomb librarian]

Hi all

and thank you for your previous answers to my questions.

Now i got how to make ability checks (for instance, a strenght check or a
dexterity check), but i still can't understand how to make skill checks
(for example, if my character has a skill in survival or in climbing,
swimming, etc...- should i roll against my EL or something like that?)

Basically, i would like to know which is the basic (standard mechanic to
make a skill check in P&P).

thanks in advance
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