The developers are generally quite attentive regarding backwards compatibility - tutorials and concepts from years ago are still relevant. If anything, newer features might have made some things easier to do though.
I do recommend utilizing the manual - it is kept up to date, well written, and is an excellent reference for whatever you're trying to do. You should also read through (up to before the references at least) it before getting started, it actually isn't very long and will save you a lot of pain in the long run.
Try not to rely on tutorials too much - there are usually many ways to achieve the same result, and it's often better to try to do it in the way that makes sense to yourself rather than copying another person's logic that you don't understand. If you're constantly frustrated by things not working out how you expect them to or how everyone seems to do it differently than you want to, it's possible the engine is not the right fit for your style.
As for specific tutorials, there are two official ones that should be more than enough to get you started.
construct.net/en/tutorials/beginners-guide-to-construct-3-1
construct.net/en/tutorials/platformer-game-2329