There's a lot of good information available on here so have a good look through. And welcome to the forum btw.
I have Hybrid, bought at 5 months old and it was the dealers demonstrator. It's 2 years old now and I still love it even though it's had all the software issues at one time or another. I still think it's a great car, very comfortable and I always enjoy the drive. Mines a 204hp V2 and is very well equipped and more than quick enough for me.
Assuming you're buying used then obviously there are all the normal things to check, V5, history, accident damage etc. I'm not going to list those as there's loads of info out there.
Used Hybrid
Formentor specific I would look out for/check the following in addition to the norms:
Software version; 1940 is the latest and seems stable. Ensure it's updated.
Ensure you get the remains of the 3 year Cupra warranty.
Front tyres tend to wear quickly. Mine's done 11000 miles and they're down to 3/4mm. When I change them it won't be for Bridgestone but that's personal preference.
Have a good look at the leather seats. Creases are normal but they're prone to scratches and scuffs due to the nappa leather used.
Check the paintwork over. The paint is quite soft, I've found, and chips easily imo. Alloy scuffs too!
Wheel nut covers tend to go missing. New ones seem a tighter fit and I've not lost one in a while.
The infotainment and lack of physical knobs takes some getting used to, but if you don't mind talking to the car you can adjust most thing that way and it works well. Turn off the voice activation and use the steering wheel button else it'll be asking you what you want all the time
.
There's a thread
here that might
help.
I'm sure some others will be along with advice so good luck with your search
. Oh, and make sure you post some pics when you've bought one.