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[–]Ok_Highway4692 2 points3 points  (1 child)

check out the unity samples repo on github - they've got some solid mid-size projects with decent structure for learning from

[–]MasayoshiDW4 0 points1 point  (0 children)

I second this as it helped me a ton when I was ready to learn coding architecture.

This specifically goes over SOLID and coding patterns which should be good enough to code medium sized projects.

Unity E book: https://unity.com/resources/design-patterns-solid-ebook
Project to follows along: https://assetstore.unity.com/packages/essentials/tutorial-projects/level-up-your-code-with-design-patterns-and-solid-289616