Actually learning and mastering guitar scales is not that difficult. The first step is to break down the neck into positions (patterns). Then realize that each of these patterns is movable. The guitar is a very easy instrument to learn to play in all keys because all patterns that we learn (not using open strings) are movable. These patterns also connect identically in each key so the work done in any one key is the same for all keys.
Below are examples for two common scales in the key of G.
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