The Three Random Words Method
The UK's National Cyber Security Centre recommends a surprisingly simple approach to creating strong, memorable passwords: combine three random words. A password like CoffeeBridgeRocket is both long enough to be secure and easy enough to remember.
The key insight is that length beats complexity. A 20-character password made of three common words is far harder to crack than an 8-character password full of symbols — because the sheer number of possible combinations is astronomically larger.
Three random words creates a password of ~18+ characters. At 10 billion guesses per second, it would take millions of years to crack by brute force. Make it even stronger by adding a number or symbol: CoffeeBridgeRocket7!
Don't pick words that relate to you (your pet's name, your city). Use a random word generator or open a dictionary to a random page. The randomness is what makes it strong.