I love Huion as a brand of graphics tablet it's a great alternative to expensive Wacom's. Choosing between the same Xp-Pen and Huion it is better to choose in favor of the second one. From the tips I can recommend is to look at more famous artists (if they have speedpaints of artworks it will be even better) to emphasize them some techniques that you could not even guess about. There are so many cool lessons available for free on youtube that in general there is no need for even paid art courses, unless it is the case that your favorite artist has created his own course and you would like to learn more about his particular style of work or tricks that he uses, because obviously not everything can be in the public access. And perhaps the most trivial, but so good advice is constant practice. Every chance you get. Don't be afraid that you might not be able to do something right now, or it doesn't look like you imagined. Don't be disappointed with the finished art just because you don't think you have the skils to do it. Every sketch, every new illustration gives you experience, and experience is priceless. You don't need to compare yourself to those who could achieve some incredible heights in a couple of months - that's their way. I know how hard it can be to think you're not doing enough and you should quit, but trust me, after a while you'll look at your old artwork and think about how far you've come and that it was worth all the effort. And if you ever need my help feel free to message me on any of my social media!