For those who are new to Bitcoin or even for the most veteran, one of the most important initial questions before investing is Where to invest ?, so there are two large groups that allow you to invest directly or indirectly in Bitcoin: (1) Forex Platforms and (2) Digital Currency Exchange Platforms:
Here there is an interesting parallel between both, very well reviewed:
https://www.forexbrokerz.com/news/bitcoin-forex-brokers-compared-to-bitcoin-exchanges
In summary, if you want leverage and security of your funds, Forex is your option, but if you want to invest in the long term and own the asset, the exchange platforms are your alternative.