I guess the research side would be helpful as well. I was asking for the actual sites to make the investments through.
I'll take any good resources. I have a sum that is uselessly sitting around and need to invest it.
As a general matter, probably one question you want to ask yourself is if you want to just generally invest in stocks or if you want to trade stocks.
There's a ton of what are known as "robo-advisors" where basically they ask you how much risk you are okay with and you just throw your money in and forget about it. These don't have trading features but if all you want to do is diversify your assets and invest in the stock market, this can be a solid option.