for bills, is having it on autopay with the biller superior to using it manually to pay that biller? I prefer to manually manage all that as I have for years but I figure its beneficial to get that on a credit card and just make sure its paid off. I already basically use a bills bank account to do essentially this manually
only purchase what I already have set aside/budgeted for and can payoff before the grace period
anything else?

Spend 30% or less (not more) of your limit and pay it off every month. Don't accrue interest. Do it for a long time.
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