Congrats on the purchase and welcome to the site - with regard to tips and tricks not sure specifically what kind you're after, but things that may interest you that you probably may not know:
* Turning lights - when the headlights are on if you indicate or turn the wheel past about 45* the corresponding fog light illuminates the kerb for you.
* Dont know if your Altea was a diesel so I may be teaching you to suck eggs, but dont try and drive it like a petrol - to get the most out of it change up at around 3200rpm - even thrashing it you should still maintain best part of 50mpg. Also allow the glow plug indicator light to go off before starting.
* As with any car, allow for proper warm up and cool down at the end of each trip.
* The button to the left of the CD Player (that looks like a steering wheel) lightens the steering for multi-storey car park adventures.
* You have a storage area hidden in the front seat - just today my passenger nearly broke mine thinking the lever would slide the seat forwards.
* Radio Test - With the radio on, holding the number 6 plus any other number will perform a certain self-test - one is speakers, its rather loud. You can also change the climate display to show RPMs apparently, but I dont have this option in mine so have no idea how - possibly.
* Pushing in the rear courtesy lights turns them on - not many people seem to know this.
* Follow me home lights - just blip the left stalk after the engine is switched off but before you take the keys out (I think).
* Lift the carpet out of the boot and check under it to see if you have a toolkit/spare wheel/jack.
* If it has white dials be prepared to never know how fast you are going (they are difficult to read under most light).
Without meaning to put a downer on things, there are a few things to be aware of - dont think it to be a hugely unreliable car, these are just the most common issues and if you spend an hour or so checking for them now you can likely take it straight back to the dealer if there are any problems:
* The clips on some of the wheel nut centre caps can snap and hence the covers come loose - give each one a few taps and make sure none are loose/about to fall off.
* Front badge - casing can crack from stone chips - check.
* Look under the front of the car and see if the heat shield is loose - on my (150 MJ Sport) they are very loose and close to the ground and can come apart if grounded out on speed bumps.
* Play a few CD's in the CD player - these can be temperamental - mine only plays some CD's.
* The washer fluid hose can leak on the join by the fuse box - open the bonnet and spray the rear (not the front jets or you'll make a mess) and check under the front left of the car for a puddle.
* Check for any peeling on the leather steering wheel/handbrake lever.
* Listen for any rattles immediately behind the instrument binnacle - a small but common issue is stuff coming loose behind there and flapping about.
* Misting up behind the rear light clusters - this is normal.
Only other thing is the only problems I've ever had have been drivetrain related (flywheel and driveshaft bearing) - I dont think the problems are as common in the petrol variants but listen as you accelerate for any nasty noises.
Other than that enjoy it and enjoy the forum, and please share some pictures!