Yep, checklists saved my butt too!

Read a blog post a while back from some guy who taught himself coding with nothing but old library books and a laptop with no internet. He said the key was that books can't autoplay the next lesson, so you're stuck sitting with the hard stuff until it clicks. There's actually a name for it, the "desirable difficulty" thing where slower learning sticks better long term. Videos let you nod along and feel smart without actually doing the work. Typing every example by hand sounds boring but that's probably exactly why it worked.

Had a 2016 Freightliner Cascadia last month that came in on the hook with a crank no start, and it turned out to be the battery cable end at the frame rail. It looked fine from the outside but the copper inside was green as grass. I wiggled it and the whole truck fired right up, couldn't believe it. Customer paid me an hour of diag and I felt almost bad taking it. Loose grounds and corroded cable ends get me way more often than anything fancy.