Thank you for taking the time to read my post and reply.
When I trade FOREX, I can Buy or Sell, at the Market, and then end the trade whenever I want.
For example, let's say I Buy at $10. It increases to $10.5, $11.0, etc. I can get out of the trade whenever I want to. I don't want to get out of the trade because I believe the price will keep going up and up.
Is this possible when I buy Bitcoin in Coinbase?
Because Forex trading is a derivative/option trading while Coinbase that you are using is a spot trading. You are buying the real tokens and you can withdraw outside the exchange while Forex is just buying of contracts of the pair you are trading which means it's not the real asset. This is why your position on Forex will just remain active when you purchased since its a contract unlike spot that is an actual tokens.
You should learn the technicalities and definition of both type of trading before you enter on the actual trading. You are referencing the price that’s why it's hard for you to understand how it works.