If you are still a beginner in this industry, then Bitcoin is the best choice for you, the problem of limited basic capital is not an obstacle for you to invest in Bitcoin because the units can still be broken down into the smallest parts (Sat).
We do not know if OP has enough capital to continue making periodic purchases because he only mentioned having a small capital. I saw OP's previous post, and he only said he has $20. It is uncertain whether he allocates that amount weekly or monthly from his work earnings.
Hopefully, OP is not thinking of using his money to buy shitcoins with $20 and hoping it will turn into $200 or $2000 in a short time. Giving advice to buy Bitcoin is very good, but investments should be based on knowledge and a plan. OP may need to do a few things first before starting.
But if that is the only amount he wants to invest and does not want to invest more later. It's not so bad that he decided not to invest in bitcoin but instead invest in shitcoins in the hopes of getting lucky and making a significant amount of money. Because frankly, investing just $20 in bitcoin isn't going to do any miracles even if he holds it for years to come. Bitcoin can't go up x10 or x100 in the next 5 or 10 years and make him rich or make a significant profit on that $20.
In my opinion, as some other members have pointed out, OP should first have knowledge and find ways to increase capital before thinking about investing. Don't invest on the advice of others, and he should give up the idea of just investing $20 and believing he will be able to make a big profit. The days of getting rich quickly and easily with cryptocurrencies are over, things have changed.