The top guitar goal that I recommend is this: Enjoy the process of learning guitar in order to enrich your life with music.
Notice that this goal is free from judgement, comparison, achievement, deadline, or even a sense of urgency. This is definitely on purpose. If guitar is a hobby for you, this goal will help you learn it in a very satisfying manner without it taking over your life.
Let's break it into two chunks, and get into why this goal is so helpful.