And apparently, there is some confusion within the community about price increases in CoinMarketCap and people think that everything is going up right now, which is not the case. The green numbers you're seeing in the price page don't represent much. If you click on the coin though, you'll see the price in Satoshi... that's the one that should be increasing.
I do agree that price increases in CoinMarketCap can be misleading for low volume coins - if a coin is 0.001 BTC, and BTC rises 10%, then with no trading on that low volume alt then that also rises 10% in dollar terms because it stays at 0.001 BTC.
But I differ a bit with regard to BTC and top alts. I think that any big crypto bull market tends to start with BTC rising fast, then BTC slows down and the good alts start to increase fast... so maybe my strategy is buy BTC as soon as it starts moving up, then once it slows switch to ETH/XRP and so on.