Bumping?

I am very new to doing this I posted some items in the classified I found out it's very hard to ship some items. lots of questions going back and forth I think I answer them in the wrong place I don't know what that means but that was told I am bumping. I have not sold car parts in 30 years last time I sold parts we did it in the newspaper. I am not very good with computers or navigating through this site Should I go to a different site that may be easier . Can someone recommend one