What's the safest way for the buyer and seller to do the transaction?
I read online that there's a lot of "buyers" that try to scam by giving the seller some check and then canceling the check after or something.
Is there some kind of way to do a safe transaction? Maybe I can record both of us talking on phone or something so I have a documentation of the agreement? Or make both of us sign a contract or something? I really don't know, I'm a noob at this

Oh and I don't want to use something like ebay because it charges alot. I need something free and effective.
I got some people wanting to buy my keytar but I don't know the best way to go about this.