Probably when you read the word "Investment"
you will soon think it's not an area that's right for you.
Ok, to be honest I would also think this (especially during this economic crisis period), but if you have time to spend reading all of the revenue methods shown on this page, you will get important tips on which to think for the future.
If you have some extra cash
and you want to exploit these earning methods with an initial investment, here's a list of all the possibilities in this category: