New in the Simulation

Hi ,

i am a Pcb Designer , learning LTspice IV .
I am learning LTSpice , pls anybody can provide help data as i dont find more interective help file in tool .

Pls tell if i have a large Pcb Project having multiple pages of Sch. ,what should i check in LTspice ? which part of circuit i should check in the tool .

thanks in advance