Happy Easter Nicolas!
First of all, I definitely wouldn’t consider myself a master of Webflow but, I’ve been using it for some time now and taught myself so I might be able to give you some advice.
Keep using the university courses, they’re a great resource as well as the Webflow community here on this forum.
Further to that, a great way to get an understanding of how you would do different things is by looking through the free templates - you can open these in your editor and dissect what’s going on so you can incorporate the same ideas into your designs or build on the ideas to create your own designs.
Another resource I’ve found great for inspiration is website award sites like Awwwards.com - If you’re looking for inspiration - you might as well be taking it from the best.
Last, don’t be afraid to experiment and try something new - it’s 2021 and you’re competing with apps, Facebook and a ton of “cookie-cutter” do it yourself website makers - you need to stand out - be fearless
If I can ever help you with anything, don’t be afraid to reach out.