It is very important that every individual should know about their own finances. Otherwise it is 99% guaranteed that you are loosing/missing your hard earned wealth and some possible free money.
Here is the information about few basic finance info:
401K - Employer Retirement account
Traditional IRA - Regular Individual Retirement Account
ROTH IRA - Roth Individual Retirement Account
Rollover IRA - Rollover Individual Retirement Account
Trad vs Roth - Comparison between Traditional and ROTH IRA
401k vs Roth - Comparison between 401k and ROTH IRA
Roth IRA FAQ - ROTH IRA Frequently Asked Questions.
Traditional IRA FAQ - Traditional IRA Frequently Asked Questions