The important principle is to take your fiat currency (mine is USD) and forget about it. You need to flip cryptocurrencies in relation to a standard: I utilize BTC but LTC Or ETH are good as well. I’d urge you to avoid TetherUSD as it has been somewhat glitchy lately.
Find a crypto that everyone is going to be buying soon:
Bitcointalk forums
Poloniex iOS app chatroom
Minergate chat
Coin telegraph, coindesk
Discord groups (find these on various forums)
Now you want to start a buy order for just above the buy wall (so if a buy wall goes from 5btc, 5 btc, 200btc, you want to place your order at the last 5btc space. Depth charts are very useful.
Now once you have the coins, sell just below the sell wall. Be careful to watch fees in your crypto-fiat if you use USD you risk LOSING money so do not rely on USD fiat.
If my guide is successful please comment back here, I’d love hearing successes. If you have questions, definitely ask! I’d love to help you out.