Common mistakes made by Vue.js developers include using composes outside of the setup function, not maintaining reactivity, and putting too many things on the store. It is important to understand the reactivity fundamentals and be mindful of what should be reactive. Contributing to open source projects and joining the Vue.js community can help improve development skills. Thinking from the back end and considering static-first approach can also enhance performance. Developers should avoid using indexes as keys and overrelying on V-model.

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