Erwin, you're obviously a person of few words. What it boils down to, and I believe many/most of the other investors that responded will agree (I'm a network tech weenie, not a "stocks person," but these are some general things to consider)
First, you need to decide on your time horizon. If you plan on putting in some money over time for five - ten (or more) years, then stocks are generally a decent investment,
if you choose decent stocks. If you are planning on buying into the IPO, make jillion bucks, then getting out (armed with your current exhibited knowledge) then don't do it. Don't even think of doing it. Your best course, as previously suggested, would be to study for a while.
Some interesting educational places to visit are places like
www.fool.com (The Motley Fool). Among other things. they have their "CAPS" community, which are basically investors preseting their opinion to other investors in front of other investors. Bullsh*tters are called out pretty quickly, and they have topics ranging from "How do I get started," reviews of virtually every stock by investors (past, present, and future) of that stock, to "how do dig yourself out of debt."
They also have articles and positon papers available.
PLEASE NOTE: they are just one of gawd-knows-how-many places willing to render information according to their investing philosophy. Personally, I like them; other people don't. Other places like morningstar.com, the street.com ... google around or ask people you trust .
The market is generally good for the long term, if you have a reasonably good stock. But, as you saw last week, it's pretty wild right now and for (probably) the next few weeks to months.
If you're looking for someplace "safe" consider a good money market. Some of the Internet banks, Pentagon Federal Credit Union ("PenFed") have some good rates.
Mutual funds are OK, if you get a good one. If you're looking for a good one, seek the advise of someone that "does" mutual funds. Morningstar generally has some good info on mutual funds, and they have some advertisers that may be able to help you. The issue with many mutual funds is that they tend to require a minimum investment (which varies by fund from ~US$500.00 to (more typical) $1000 - $2500.00, to hundreds of thousands. They also tend to hit you with penalties if you pull the money out "too soon."
A compromise between Mutual funds and stocks are Exchange Traded Funds (ETFs). ETFs trade like stocks; you can buy and sell them just like a stock, and they are taxed like stock transactions (i.e., cap gains), but each share represents a piece of a "basket" of a particular type or sector of the stock or bond markets.
So, with ETFs, you are buying a diversified investment with every share. There are ETFs for pretty much every sector (like semiconductors, real estate, utilities, money, bonds ...) so you can buy the spread for whatever your favorite interest is (there are even "green" ETFs for the tree huggers).
I have a couple ETFs that have been good to me for a while: EWA (Austrailian market), PHO (Water Utilities), PWO (over the counter companies), EWS (Singapore market) ... and some others. To see the range of ETFs, check out iShares.com or vanguard.com or google on Exchange Traded Funds.
ETFs are a little safer than a single stock, but because they are safer, don't have the returns that a (good) single stock would have.... but they're still generally above the index they track. You also need to pay attention to the administrative fees (usually ~0.5% neighborhood).
The Theme you'll catch at some point is Risk/Reward; genarally anything that is likey to give you an amazingly high return also carries amazingly high risk. Lower risk things tend to have lower returns. Anything that requires a lot of management will have higher management fees.
One of the things I like about Morningstar is their rating system, which presents the item of interest (stock, MF, or ETF) in terms of risk/return. If you can find something with low risk and (relatively high) return, it's "probably" a good thing to get into.
If you decide that you just have to get into something right away, then jump on in, but don't bet the rent. Start small and add to the position as you gain comfort in it. Look into something like ShareBuilder.com, wheere you can buy pretty much any stock in any increment you want, even fractional shares.
(READ ALL THE DETAILS BEFORE JOINING ANY ONLINE INVESTMENT GROUP: ALL OF THEM HAVE SOME "GOTCHAS")
Finally, if you can provide some details, like about how much money you're talking about, to be invested for about how long, and what you "risk tolerance" looks like, some of the smarter folks can jump in and give you some better, substantial advice.
Good Luck
Scott