Used Car Advice

I am buying a used honda accord touring 2018, 2.0T engine.

I am buying from a dealership but I know sometimes dealerships can not do everything needed for the car. I was going to get a tune up but reading through the thread that isn’t “a real thing”.

So, I can definitely go by what the owner manual says but sense it’s used car should I do more?

Lastly, after buying a used car what are the things you should do?