Add a Cancel By Reminder the Moment You Start Any Free Trial

Companies offer free trials because they know most people forget to cancel. The moment you sign up for any free trial, set a calendar reminder for two days before it expires. Title it "CANCEL [service name] or get charged" so it's impossible to ignore.

This one habit can save you hundreds per year in unwanted subscriptions. Don't rely on your memory or on the company sending you a reminder — they won't. The entire business model depends on you forgetting.