I know this isn't the advice you want, but it's such an important part of the decision that I must emphasize it:
It all depends on these things:
- Your financial stability
- The time over which you'll be investing
- How much money you have
- Your sense of risk and reward
If you're in a stable position (employed, no debt, enough money for a 'cushion') and wish to invest long-term, then something like a Roth IRA would be good, where you're investing post-tax money and will get all the gains from it (you have to have the account a few years and be about 60 to avoid fines though; this is fine because it's intended to be a retirement account). Long term investment strategies give the most gain while still being mostly stable; unless you can make it your full time job, playing individual stocks is like playing slots.
There are also many, many mutual funds to choose from. Having taken classes before, you probably know this, but these funds are collections of stock and other assets that are managed to have a specific level of risk vs reward; you can purchase into these yourself, but if you don't know what you're doing, you might want to get some professional consultation. Keep in mind that you do have an up front fee for these funds, which you can not recover when you sell.
(I don't have an IRA or any mutual funds, because my financial situation doesn't allow it currently)
For short term investments (a couple of years), you have CDs and money market savings accounts; the rates on CDs are usually only slightly better than the savings accounts, but aren't liquid in the least, however, the bank accounts have minimum balance requirements and are usually tiered based on how much money you have in them (personally, I think that if you have the money to get the higher tiers, you should consider investing it in something with better gains).
(I have used CDs and one of these savings accounts; as a college student without consistent work, I decided that this was the best course for me until I have consistent income)
As for resources, I highly recommend Dave Ramsey's radio program for a consistent stream of money advice (I don't know if this goes over anything other than AM radio in the US, so if you're not in the States...). He has multiple programs intended to teach money management and basic investments; there are books, CDs (the audio kind), websites, classes, etc; he's pushed into every medium possible, excluding television (maybe). Beyond that, I don't really have any suggestions; I've only picked things up from that show and people I know; never took anything more than a basic economics class.
Anyway, I suggest you look up some of Dave Ramsey's products for the ground work; hopefully one of them fits your needs.
Also, here's a site where you can purchase mutual funds and such, conveniently on a page describing Roth IRAs (and trying to sell you one at the same time):
https://investor.vanguard.com/ira/roth-i...mpgn=PS:RE
Keep in mind that they'll be trying to sell you stuff, though.