Find whatever works for you. There's no right or wrong way. I think most people use collections as the main organizational tool for their libraries.
I use tags for specific projects/non-substantive classifications (e.g. I tag my own publications by publication type like 'peer reviewed' for my CV) and colored tags to mark things like read/to read and the like.
Use both. And saved searches. Different knowledge domains may need different approaches.
Be aware of "collection bloat" though, where you end up with dozens or even 100s of collections, where it can be hard to find items you want ... buried somewhere. It's hard to recover from that. On the other hand, my tag list is several hundred long, and much more specific.
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I think most people use collections as the main organizational tool for their libraries.
I use tags for specific projects/non-substantive classifications (e.g. I tag my own publications by publication type like 'peer reviewed' for my CV) and colored tags to mark things like read/to read and the like.
Be aware of "collection bloat" though, where you end up with dozens or even 100s of collections, where it can be hard to find items you want ... buried somewhere. It's hard to recover from that. On the other hand, my tag list is several hundred long, and much more specific.