Set limit orders for a few dollars under or over recent lows and highs. This can result in you buying or selling before BTC hits resistance. Sure, you can use crazy TA skills to find support and resistance levels, but you can also eye out levels by looking at a chart. 9 times out of 10 you’ll be able to eyeball a general support or resistance level and get close to the level a pro would have charted out (partly because the price has likely stalled on / bounced off those levels before; little parlor trick).
Always pay attention to Bitcoin. Most altcoins (every cryptocurrency except Bitcoin) are pegged more closely to Bitcoin than Asian currencies were to the USD during the Asian Financial Crisis. If Bitcoin price pump drastically, altcoins price can go down as people try to exit altcoins to ride the BTC profits; inversely, if Bitcoin prices dump drastically, altcoin prices can go down, too, as people exit altcoins to exchange back into fiat. The best times for altcoin growth appear when Bitcoin shows organic growth or decline, or remains stagnant in price.