What are the ''Eight biggest mistakes investors make, and how can l avoid them?''

l do not know if l can supply you with eight, but l can supply you with two:

1. Failing to limit losses and
2. Being too timid about taking risks

Picking stocks just because they've heard of the company.

Believing in diversifying their portfolio, but then putting too much in one stock when they think they have a good idea.

Thinking they are smarter than the efficient market.

Caring too much about market timing. (Not that this is a bad idea right now)

1) blindly giving someone else control of ur money.
2) believing people with a conflict of interest.
3) assuming that the financial gurus will agree.
4) not knowing there r permabulls & permabears selling advice that will only be right eventualy.
5) not using RealMoney.com
6)not learning some technical analysis.
7)not learning some fundamental analysis.
8) not selling

Want a short cut, subscribe to realmoney.com & read Cramer (leaning bull), Kass(leaning bear), Rev Shark (it is okay to sell), & Robert Marcin(value guy).

This is a good article on the mistakes investors make - http://ezinearticles.com/?Common-Mistakes-Investors-Often-Do-For-Trading-Stocks&id=1377731

The complete list is at THEFOOL.com published by The Motley Fool Stock Investors.

Selling before the 1 year capital gains threshold.
Holding on to losers for sentimental reasons
Not buying on ''dips''.
Only buying products you personally know.
Buying only big name stocks.