Plenty of Bob Ross’s techniques will be helpful, but his methods aren’t universal. You can learn lots by how he paints mountains and trees, but you don’t need to do it the same way he does. If you want to paint impressionist seascapes his liquid white method is probably not a great method for you. I paint in a traditional style now usually, with under painting and glazes. Bob Ross is totally irrelevant for that method. You can pick and choose what techniques and methods of his you’d like to use, but you don’t have to use them all. Painting should never be a chore when you’re first starting, it makes it easier to get burnt out. If you are serious about learning to paint, and want to avoid years of frustration, start with learning the fundamentals of drawing. Then start reading about color theory and play with some watercolors. They’re inexpensive, familiar and easy cleanup. Many of the elements translate into painting: composition, values, depth, line weight, etc., etc. These basics are better learned with a pencil and a sketchbook. When you get proficient in the discipline of drawing, then graduate to oil paint.