I think if you have extra money, it's best to choose coins that are in the top 10 crypto markets such as Bitcoin and Ethereum, because these two coins have huge potential and popularity in the crypto market, and I think BTC and ETH are two coins that can gives a sense of security to the holder, and of course you will get big profits if invested in the long term.
In terms of support and communities who are working with both Bitcoin and ETH though the price now is really high but the chance of gaining profits is still possible if are willing to hold in a long term position, it's really good to include both BTC and ETH in your porfolio, then always do your DYOR for you to able to locate what particular coin to add up for your investment, both long and short you can use your money to segregate and buy assets portion by portion, it's good not to invest everything in one basket.