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I understand, that is how I started. But I don't recommend it. I made about 30% on my portfolio in a month by doing it. When I stopped, did some serious research on which coins to pick, and instead went for a medium-term hodl, I have since tripled the worth of my entire portfolio in Bitcoin worth. Anything that is destined to go up in the long run, is a safe market to play in too, because even if you end up holding the bag you can rest assured that one day, the price will be up again.

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!