Fool.com: Stock Investing Advice | Stock Research is a great site for investment information. It's primarily U.S. based, but there is a lot of good basic material that applies anywhere.
If mutual funds are in your picture, then consider index funds. In general they outperform managed funds when you take into account the management fees.
Diversification is important, don't put all your eggs in one basket,
Something my father (bless his soul) told me a long time ago. Never put more money in any single stock than you can afford to lose.
Another interesting rule of thumb my father told me. If you are trying to decide whether or not you should sell a stock, then consider the current market value of the shares, and ask yourself if you would invest that money into the stock if you didn't already own it. If the answer is no, then the logical thing is to sell, because it means you think the money is better spent elsewhere. Think about it. It's a great rule of thumb
Beware of over trading. Too many brokerage fees is a great way to piss away your profit margin.
