Plan to take phone calls only (no text or email) and set up a separate gmail acct
Don't put any contact info in the ad. That just invites spam and nuisance calls. Instead post that the reader should email his phone # to the temporary email that CL shows in the ad. CL will forward it to you immediately.
This puts you in control of the transaction. You decide when to return his call, instead of receiving phone calls late at night or months after you sold the item. Your email files will include a list of who your potential customers are, just in case you need a police investigation later because your tractor was stolen or you got mugged. Or the customer's check bounced a month after he departed with your tractor. If you let him call you first, he can remain anonymous throughout the transaction and there is no way to trace him later.
These bad consequences are very unlikely - but following these steps that force him to reveal his identity will scare off the troublemakers so you never see the overseas scammers and general idiots that CL has a reputation for.
The other cautions are obvious - if someone wants to write you a check for a large amount, instead go with him to *his* bank so he can write the check to pay for a money order etc that he hands you in the presence of the cashier. (don't accept a money order that you didn't see him buy!). If an offer is made to overpay, with you refunding the excess, ignore it.
If you control all aspects of the transaction like described here, selling on CL should be easy and fun.
I have bought a lot of stuff on CL, sold the leftovers from closing out my parents estates, and used to list my rental on CL. Controlling the transactions as described above, avoided a lot of pointless chaos.