I'm an economist, and let me tell you that most of what the people before me have said is nonsense - sorry.
# The first and most important rule of investing is: diversify. You should never put all your apples in one basket. Do not invest all of your savings in stocks or property or government bonds or whatever.
# Second, everyone who is promising you easy fortunes or an investment opportunity that is both very safe and very lucrative is a liar. There's always a trade-off between risk and reward.
# Third, don't invest in anything you don't understand.
# How anyone can say property is a safe investment just ~5 years after a big property bubble burst in the US (which was by no means the first bubble) is beyond me.
# People who buy stocks of the company they work in are idiots (unless they are heavily subsidized and prohibited to sell them). If things go bad for their company, they lose both their jobs and their investments.
# The stock markets are not systematically rigged, they're not extremely volatile and you do not need to be an expert to invest into stocks. In fact, being an expert doesn't even help you - statistically, you can't beat the market. And while you should not invest everything into the stock market - diversify! - shunning the stock market entirely is an equally bad idea. Yes, stocks are riskier than, say, property, but the average returns on investment from stocks are just much higher (~8% per annum) - and by average I mean the average over decades. Don't forget that a large share of your earnings from stocks do not come from gains in the value of your stocks, but from dividends.
Yes, stock markets can crash, and your stocks will lose a lot of their value in the process, but you already got your dividends (as long as you haven't reinvested them all). But that's why you shouldn't invest all in the stock market, just some.
# Do not even bother looking at individual firms or industries and try to figure out what the future might hold for them and if it is hence worth investing. People who know much more about the stock market and the respective industries than you do do that already, all the time, and price this information into stocks. And they still can't beat the market.
Buying stocks from individual firms is something that you should never do anyway. Tying your fortunes to the fate of a selected few firms is just very risky.
# The best thing you can probably do in the stock market, imho, is to invest in index funds that reflect the stock indizes they are based on as a whole, such as the Dow Jones, DAX, or Nikkei, and not worry about it anymore after you did. If the stock market goes up, you win, if the stock market goes down, you lose, but at least you don't have to pay any fees to brokers because it's an unmanaged fund, and you are much more diversified than you were if you invested in individual firms only. And you don't really want to invest in managed funds because, as I said, statistically, you can't beat the market, so why paying for someone who tries to.
If I had a considerable amount of money to spare, that's what I'd do anyway.