Once stock has been cut to size, and this is related to a close examination of the lumber for the defects shown above, one can proceed to jointing the face of a board. With cup and bow, the concave side should be down, into the jointer. ( A Jointer is a tool for preparing a flat face or edge on a board ) This way you have at least two surfaces to register against the tables. With warp, one has to choose the best face, that gives the most control over the board. This is where I cut down to the smallest dimension needed. Wane, here, it's an addition. With Woof, well, ... take it for a walk, give it some snacks, cause Woof is never going to be good lumber.
Two images of face jointing a board. On my jointer, which has a European guard, the left, pressing down hand, comes to the guard and slides over it, while the right pushes. As an aside, I wear gloves to give me more grip on the board, which in terms of safety, is an either or situation. I like better control of the board, but there is increased risk from any kind of clothing getting caught in the blades. Think, and keep your hands away from the cutters.
This is an image of the board going through the thickness planer, referencing off the jointed face, from the previous operation. Using the flat face, the planer reduces the stock to an equal and parallel thickness. Once the stock is the proper size, one of the edges will need to be jointed, as a reference for the table saw, to cut to width, as in the picture below.
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