Learn to value coins in BTC. Ether aside, Bitcoin is the current primary currency of the crypto economy (i.e., its what you have to use to buy most altcoins). Those new to crypto tend to value things in dollars. Meanwhile, even seasoned cash traders value coins in dollars. However, enough crypto traders will value coins in BTC for it to matter. If you aren’t aware of the BTC charts, you won’t be able to properly understand the trends everyone else is analyzing and reacting to. You don’t have to make getting more BTC your goal, but you must have the BTC prices of altcoins on your radar. There are times when all coins move up, but altcoins steadily lose value against Bitcoin. Those who know will be the first to dump altcoins for Bitcoin; this will set off a vicious cycle that can result in the stagnation of altcoin prices.
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.