Start with high-confidence landscapes & seascapes books, then narrow by subgenre or adjacent topics.
Draw Your Adventures
Samantha Dion Baker
Wild Watercolor
Karen Elaine
Learn to Watercolor
Lacey Walker
Needlepoint: a Modern Stitch Directory
Emma Homent
Posh Adult Coloring Book: Thomas Kinkade Designs for Inspiration & Relaxation
Thomas Kinkade
Keeping a Nature Journal, 3rd Edition
Clare Walker Leslie
A Year of Watercolour
Harriet de Winton
Watercolor Workbook
Sarah Simon, Paige Tate & Co.
Draw Your World
Watercolor Boot Camp
Hannah M. Pickerill