Pai depinde ce fel de cursuri de informatica vrei.
http://www.w3schools.com/ - orice este legat de site-uri (HTML, PHP, Java, MySQL si altele)
http://www.cplusplus.com/doc/tutorial/ (C++)
http://www.taoyue.com/tutorials/pascal (Pascal)
http://office.microsoft.com/en-us/training-FX101782702.aspx (Microsoft Office)
Pai cam orice cursuri(incepand de la refacerea windows-ului, adaugare programe la alte lucruri mai complicate).