What is the best free site for do it yourself, home improvements for pluming? i have a issue with a toilet.?

the toilet has been replaced now for about two months and every 10 to 15 min it makes a sound like water running, but the handle hard an you cant jiggle it, like when a normal toilet is running. also when this happens and im taking a shower, i get scolded so i hurry up a take my shower, then i listen to it all night long. Now the toilet in question is in the basement. an when it runs it runs for like 30 secs and stops an repeats itself every 10 to 15 min. please help. even if you don't know a site an you can just tell me ideas.