The whole category in one page.
THE THINGS THAT PREVENT MOST PROBLEMS
Automatic updates. A standard account rather than an administrative one. Free disk space. A backup that has been restored from once.
Restart weekly, and first whenever something is wrong.
SYNCHRONISATION IS NOT A BACKUP
A deletion, a corruption or an encryption synchronises everywhere. Keep a copy the live system cannot alter.
THE HABITS THAT SAVE THE MOST TIME
Consistent file naming, with dates as year-month-day. Search rather than browse. Paste without formatting. Templates for anything repeated.
"Final, final2, final-really" is the universal symptom of having no version convention.
THE HABIT THAT DEFEATS MOST FRAUD
Never use links in messages about accounts — go to the site the way you normally do.
Never give a verification code to anyone. Spelling and grammar no longer identify a fake.
USE A PASSWORD MANAGER, AND STORE RECOVERY CODES SEPARATELY
Otherwise losing your phone locks you out of everything.
THE FOUR QUESTIONS FOR ANY PROBLEM
What exactly happens, when did it start, what changed, and is everything affected or one thing?
Most problems follow a change. Record the exact error message.
WHAT NOBODY CAN RECOVER
Data that was never backed up.
WHEN HELPING SOMEONE, LET THEM DRIVE
People who feel foolish stop asking, and hidden problems are worse than admitted ones.