What currency should I start with

Depends if you're mining or trading. BTC isn't as profitable if you're mining.

Dogecoin is a great start, Great and friendly community over at reddit.

So if Bitcoin is the best choice, is there any way I can start investing with $50-100? Or do I have to go over $500 to even have a chance?

The main ones like Bitcoin, Ethereum and TRON, so I also recommend taking a look at how each network is directed

It really does depend on what you are searching for. As others have said, stuff like Ethereum and Bitcoin tend to be relatively safe bets and have plenty of uses. I personally am a fan of Stellar

The best crypto to invest in is the one you find yourself. I guess you're free to spend your money as you wish, but don't expect to get anything except self-serving answers here (even if the person is helping you out, they're likely serving themselves by doing so).

I recommend u ethereum. Good experence with it. But BTC is good too.

to start bitcoin is recommended.
you can get a feel of the market that way to better study

you should start with bitcoin or ethereum there good investment

i think you should start with bitcoin. the perfect investment