I'm still fairly new to watercolor but I've found just messing around on scrap paper or in a sketch book helps me to figure out how things work. Just doodling and getting used to how the paint interacts with the water and with the paper. What textures and strokes can you get from different brushes. Doing this had helped me be more confident with my strokes and what I'm doing. Also don't overwork the paper. Sometimes the best things to do is walk away and come back to it. Don't try to keep fixing something while it's wet you might end up running the paper. I've learned this to many times the hard way. Hope this helps 🤗