Unspoken conventions of coding

I’ve been watching a React tutorial series, and at one point the guy mentioned that he alphabetises his import statements. When I asked him about it he said is was just a common standard for web dev things and he does it for CSS properties and sometimes methods too.

So my question to the pros on the forum, are there other ‘unspoken conventions’ (I.e, unspoken by FCC, anyway) that newbs like me might be missing?

I’m not a pro, but I found these links (about css, thanks to codepen’s analyze css feature):

Poll Results: How do you order your CSS properties?
The CSS Lint Rules

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Great! I really like the comments and the link to Idomatic CSS in the CSS tricks one.