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Welcome to the world of cryptocurrency, I wish you to be a successful investor and bitcoiner. For long-term investment for now I recommend Cardano (ADA), TKO, TRX. It is reliable crypto for a long-term investment with small capital, if for example, you have a large balance, you can use BTC, ETH.
The five coins that I highly recommend above are opportunities for a good future. Hope it is useful.
Stick with top altcoins in the market even though it doesnt give out guarantees but it is something better compared when you are just simply trying to deal with those low cap shitty coins.