I agree on this. We must not invest on coins that doesn't give real value and cannot generate supporters because it is very dependent to the support it will get to the market. If there are no users to support a certain coin or alts then it will be too risky to invest on it. First of all investing on crypto was risky because it was new how much more on those alts that are new in this space so it is much better to invest on those coin that are there long time ago like bitcoin.
That principle must be understood. If there is no real function, then there is no interest. Sort of useless. In this case we have to do an analysis, and the charts in coin marketcap provide enough clues to choose the popular and popular markets. We take the example of ETH, the product is used in most new projects, just waiting for the pump price. This is a long term investment.