LTSPICE HELP

Hello, I was wondering if anyone knew any good sources that teaches how to use LTSPICE? For the following link, I was wondering how he was able to do everything on that link. I only have the knowledge to create a circuit and just receive the outputs. Any help is appreciated!!!

http://www.ecircuitcenter.com/Circuits/op_ibias/op_ibias.htm

I would suggest you sign up to this free user group.
https://groups.yahoo.com/neo/groups/LTspice/files

Lots of examples etc.

https://groups.yahoo.com/neo/groups/LTspice/files/ Tut/

Maybe more advanced and specific but well explained, google simon bramble.
I was leaving out LT's own site with short specific tutorials.

More recently in forums you see people posting .asc files. Peek there (one of them, precisely Eric).