I believe that they're popular mainly because well it was the first of all cryptocurrencies to be made. Honestly most of the other coins are scams and greedy ways that the developers make money. The only other coin I can think of that isn't a scam are dogecoins! What do you think?
Maybe Bitcoin is not the first coin made in the crypto world but why bitcoin is more popular because of it
Bitcoin Can Be a Business
How can? Of course I could. There are only 2 ways in general to be able to benefit from bitcoin that is making bitcoin and trading bitcoin.
Creating Bitcoin, either by mining a harware or a mining cloud. Both produce bitcoin but different ways.
Bitcoin Trading, takes advantage of the difference between buying and selling bitcoins. This value is a safe and effective way to benefit from bitcoin.
And for other coins that are not less popular today may be etherium because etherium also uses Blockchain technology such as Bitcoin.