Bitcoin is the top digital cryptocurrency in the world, it was created in 2009 by Satoshi Nakamoto, and it is not operated by any government but individual and parties and it is stored and traded using blockchain technology.
It has the big investors and others, Its price often fluctuates, and its existence is not physical.
Bitcoin has gone through many cycles of boom and bust and after gaining widespread success it inspired many other founders of cryptocurrencies.
All you have to do is create your account on these exchanges, you will need a wallet which is an online application that will store your currency.
Once you have done making your account, you will transfer your real money to buy cryptocurrencies you can also buy cryptocurrencies through your wallets you just have to link your account to your wallet.
Whereas some cryptocurrencies can only be bought using other cryptocurrencies but not from real money.