Also, if you have only a small fund to invest with, be on the lookout for free cryptocurrency. You'll be able to sell it for the cryptocurrency of your choice. Sometimes you can get crypto for free when new cryptocurrencies launch. For example WCX tokens, you can get about $5 worth of them and I imagine they will be worth more when the ICO starts in 2 months and trading begins in october. Could end up being free $50 for all I know. Go check it out:
https://steemit.com/cryptocurrency/@pandorasbox/wcx-decentralized-cryptocurrency-exchange-20-of-transaction-fees-paid-out-in-dividends-to-token-holders-get-50-free-tokens-link
Additionally, you can get free LBRY credits if you sign up with your credit card for a beta account. Beta indicates a release might be upcoming, and you can try out the product. I've received a newsletter which pays you some LBRY credits to watch movies on LBRY too. I didn't do it because I don't want to link my creditcard but others have and it appears to be legit. I consider LBRY to be an interesting investment too btw. I am about 5% of my portfolio in LBRY credits. It's interesting because it has a small market cap, so it has a high chance of multiplying.
There may be other options to get free coins here and there too, which will help you with an initial boost!