Start with high-confidence landscapes & seascapes books, then narrow by subgenre or adjacent topics.
Painters of the Northwest
John Impert
The Highwaymen
Gary Monroe
Landscape Painting
Mitchell Albala
Monet and Venice
Lisa Small, Melissa E. Buron
Lee Hammond's Big Book of Acrylic Painting
Lee Hammond
Creating Textured Landscapes With Pen, Ink and Watercolor
Claudia Nice
Drawing Nature for the Absolute Beginner
Mark Willenbrink, Mary Willenbrink
Landscape Painting Essentials With Johannes Vloothuis
Johannes Vloothuis
Pacific Northwest Line Drawing
Peggy Dean
Watercolour Landscapes Step-by-step
Geoff Kersey, Wendy Jelbert
Watercolour Sourcebook, the
Geoff Kersey, Terry Harrison
David Bellamy's Landscapes Through the Seasons in Watercolour
David Bellamy
Impressions in Watercolour: Turner and His Contemporaries
Ian Warrell
30 Minute Artist: Painting Water in Watercolour
Terry Harrison
Everyday Watercolor Seashores
Jenna Rainey