for those who have the ability to do market analysis will do the analysis first before deciding to invest in a coin or project. The main focus on fundamental analysis because this is what can be observed at the beginning of the project being launched, some people don't do that when they first invest, but actually that's not a big problem because if they choose to invest in top coins, they just have to see the movement in the market and choose the top coins on CMC.
I don't think most investors in the market can conduct fundamental analysis accurately and comprehensively. They usually only have enough time to track price fluctuations and use price charts to apply a few basic indicators. If they need additional information to make investment decisions, they will often pay attention to macroeconomic news because it can directly affect BTC price and then impact the entire crypto market.
Choosing top coins also involves many risks because, apart from BTC and ETH, many top coins can fail in a cycle. For example, XRP, EOS, BCH, NEO, and XTZ failed in the 2021 cycle even though they were top coins in 2017. For me, investors can allocate 50% of their capital to BTC, 25% to ETH, and the remaining 25% to other ALTs in the market.