Suggestions for watercolor tutorials and simple projects.

https://www.youtube.com/watch?v=TOe5DAnFkI4

https://bydawnnicole.com/10-fun-watercolor-projects/

https://catholicsprouts.com/25-creative-watercolor-projects/

https://watercolorpainting.com/painting-ideas/

When you are learning a new medium, I highly recommend just playing around with it. Here are some really cool ways to modify watercolor:

https://theartofeducation.edu/2015/02/18/7-deceptively-simple-watercolor-techniques-that-will-amaze-your-students/

Useful in any visual art medium, experiment with thumbnails to test different color combinations before doing a bigger picture. These can be fun and relaxing to do because you're just exploring -- there's no need to worry about details.

http://bbnewtonartjournal.blogspot.com/2011/01/35-thumbnails.html

https://mitchalbala.com/getting-the-light-right-the-power-of-the-color-study/

https://drawpaintacademy.com/color-studies/

Look at some different palettes and color combinations, then try painting in those.

https://www.creativecolorschemes.com/resources/free-color-schemes.shtml

https://brightside.me/article/the-ultimate-color-combinations-cheat-sheet-92405/

https://www.canva.com/learn/100-color-combinations/