hey!!! my sharepoint site have error!!! as you get the escalation from user , what log you will check first ? for me i will check on the following sequence:
Event logs : this is the first log to check…because want to know server is working fine or not. (simple way to overview for application and server)
IIS LOG: C:\WINDOWS\system32\LogFiles [different web apps have ID, so you can refer to IIS see which folder you should refer to the correct folder ]
Over here you can get more detail on the user information and activity going on at IIS.
ULS (Unified Logging Service )LOG : [%CommonProgramFiles%\Microsoft Shared\web server extensions\12\LOGS]
This log mainly is for sharepoint log only , you need to enable the log at CA page.