If you're feeling lost in React land check these wonderful resources:
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Thinking in React. Create an app from scratch in a few minutes to understand the mindset behind React. Absolutely recommended.
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Basic theorethical concepts Sebastian Markbåge's attempt to documment the thinking on UI building that inspired React. Spoiler: React will be gone at some point, but these are important concepts that are here to stay.
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React patterns. Great summary of the patterns that are often used throughout React apps. Going over these will get you up to speed pretty fast.
Remember, to play with React great sandboxes are CodeSandbox or a new project created with the Create React App generator.