How to Search BADI / User Exits

Hi,

Given a transaction what r the ways to find the applicable BADIs ?

Should we only search the get_instance method or there exists some better ways to search the BADI ?

Also given a transaction what r the ways to search for user-exits / customer exits ?

In this case also should we only search call customer-function ?

What r the standard ways to find user-exits/ customer exits and BADIs applicable ?

Regards,

Nitin