How do I get my money out of blockchain?

Excuse me, I'm a bit confused about something. I've been investing in cryptocurrency and I've noticed that my funds are stored on the blockchain. I'm wondering, how do I actually withdraw my money from the blockchain and transfer it back to my bank account or another form of currency that I can use in my daily life? Is there a specific process I need to follow, or are there any fees associated with this? I'd really appreciate it if you could clarify this for me.