I'd probably say Renoise is not very good to start on..
Renoise was the first tracker I really started using. It was a little different around 2007-2008, but for the most part it was ok for learning the basics of tracking and later on I started to learn about automation and stuff.
The only really confusing part is maybe mixing in renoise. You have to know about compressors and stuff and even today I'm simply trash when it comes to making songs sound nice and polished in renoise.
Me, personally, I'd say something like GoatTracker would be a pain to start with.