How do I pay in bit?

Excuse me, I'm a bit new to this cryptocurrency world and I'm trying to figure out how to make payments in Bitcoin, or as you mentioned, 'pay in bit.' Could you please elaborate on the process? Do I need a specific wallet? Do I need to convert my traditional currency into Bitcoin first? Are there any fees associated with the transaction? And lastly, is there a way to ensure the security of my funds during the payment process? I appreciate your help in clearing up these doubts.