I think it sounds like you have a dealer who is bending over backwards to help. He is a much better resource than us, if simply because he can show you things in person.
Swap the bar, give him money, whatever he wants. And I'd probably include a 6 pack or some donuts or something. What someone can show you in 5 minutes will save you an hour of watching YouTube videos and you will know who is giving you advice.
Time is valuable, both yours and his and he seems generous with his.
This isn't the last thing you need to know about chainsaws!
And if you hang around here, well, next thing you'll want is a junk saw from under his bench that you can try and rebuild to continue learning. Many of us do without a local dealer, but we've been at this for years and have forgotten how lucky we were to be guided through the learning process by someone.