It's nice to have as a backup, but I try not to use credit to buy anything, ever. We do use them for travel because you sort of need to, to reserve rental cars and such.
Cash back cards can be really nice, if you're religious about paying the balance every month.
Mostly, we're trying to improve our credit so we can get a HELOC in a few years when our house will be due for a new roof.
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Instead of a HELOC, why not collateralize crypto? Borrow against it?