A shop needs more regular attention than a brochure site.
DAILY
Check for new orders and process them Check payment against any bank-transfer orders Answer customer messages
WEEKLY
Apply plugin and WooCommerce updates, having backed up Check stock levels against low-stock alerts Test that checkout still works, with a real low-value order occasionally Check that order emails are arriving
MONTHLY
Check WooCommerce > Status for warnings Check resource usage in cPanel Clear expired transients and old sessions Review abandoned cart numbers Check disk and inode usage, since product images accumulate
QUARTERLY
Test a backup restore on a staging copy Review product descriptions and prices Review which extensions you still use, and remove the rest Change administrator passwords
THE ONE THAT MATTERS MOST
Testing checkout. A broken checkout is invisible from the admin side, and every hour it stays broken is lost revenue. Buy something from your own shop regularly.