Twenty-five years have passed since the start of one of the most famous five-digit numbers in pop culture history: "Beverly Hills, 90210."

Brandon and Brenda Walsh first set foot inside of West Beverly Hills High School 25 years ago today, starting an adventure that would last for ten full seasons — many of them without Brandon and Brenda — and even launch a spinoff show. At least Brenda had the decency to show up for that one.

But we're not just saluting "90210" for giving us the likes of Kelly Taylor, Dylan McKay, Steve Sanders and the rest of the gang — we're also saluting the show for imparting invaluable life lessons, such as...

Don't trust the new kid on the block.

Chances are she's Valerie and she's here to poison your whole world.

If you ARE the new kid on the block?

Be Brandon, and be awesome.

Don't do drugs.

Drugs are bad.

Don't play with guns.

Guns are bad.

Watch out for the bad boy rocker.

If he's anything like Ray Pruit, he's going to hit you, and that's not going to be cool.

If you're going to rock sideburns…

Rock them hard.

Don't piss off mobsters.

They'll blow up your dad.

Seriously, don't piss off mobsters.

They'll shoot your wife — BY ACCIDENT, but still.

If you're a teenage parent…

Then be as awesome and responsible as Andrea Zuckerman — which means, get the heck out of Beverly Hills when the kids get too rowdy. (See also: Hilary Swank.)

Keep an eye out for true love.

It might come out of nowhere, like it did for Steve and Janet.

Prepare to be disappointed.

Was the other night in the limo your first time? DIDN'T THINK SO.

Find a way to forgive.

Eventually, David and Donna reconciled, got married, and lived their best life. Keep an open mind with people who burn you… at least to a point.

It's never too late to call off the wedding.

I didn't say it's COOL to call off the wedding, but if Brandon and Kelly can do it, so can you, if you must.

There are two sides to every story.

There's a Peach Pit, and there's a Peach Pit After Dark. There's Maroon 5 playing at the Peach Pit After Dark, and there's Maroon 5 playing at sold-out concerts around the world. The list of examples goes on.

You can leave, but don't leave forever.

Take time away if you need to, but come back for a check-in at least.

And if you ARE going to drive off into the sunset?

Coming back via video message is lame and it does not count. Gotta be honest, Priestley, I don't think we're ever letting that one go.

Don't be the last one to the party.

No one remembers the Gina Kincaids of the world.

You never know what the future will bring.

Who knows? Another "90210" reboot could be just around the corner.

If all else fails, be Steve Sanders.

Especially important where sharknados are concerned.