We have the "teach a man to fish, not give a man a fish" philosophy. We've always done whatever it takes to put our son in the best possible position to be a successful and competent adult.
That's started from the earliest of ages when we taught him to read, write and basic numbers before he started school so he'd be "ready to learn" when he got there. We've supported him throughout school, not by doing his homework for him nor packing his rucksack, but by ensuring he had all the resources he needed, somewhere to study, access to study books and internet etc. We've always shown an interest in his education, asking him what topics he was studying, looking in his exercise books to see the standard of his work, always attending parent's evenings and other school events. We helped him set up revision timetables and bought him revision materials for his GCSEs and A Levels. Helped him choose a Uni course and Uni, went with him to several Uni open days, discussed future career paths, etc., all paid for by us of course. During Uni, we've paid half his rent and other costs so he didn't have to take out full student loans (interest rate is crippling on them).
We wanted him to be independent, so paid for his driving lessons from his 17th birthday and also took him out practising in our car, enabling him to pass within 3 months of starting, put him on our insurance policies so he could build up his own no-claims discount, encouraged him to drive our cars regularly when he's home from Uni to keep up experience etc ready for when he starts a job and gets his own car.
Over the past few months, we've supported him through his job application processes, including taking him to interviews hundreds of miles away (which we paid for, both fuel and hotels). He's secured a good job (excellent prospects but low-average starting wage) in a different city where he'll need a car and need to rent a flat - we'll be paying his flat deposit and buying him a used car to get him started there, plus setting him up with whatever furniture he needs, a desk/computer for further study/exams, etc., depending on rental costs, we may have to support him maybe 50-50 on his rent for the first year or so.
But that's it basically. It's over to him once he starts. We're not paying towards holidays or weddings or hobbies or food, fuel, clothes, etc. We think our job as parents is over - we've got him to the stage where he has excellent qualifications a job with excellent prospects, help him start out with a flat and car. We've "taught him to fish" as it were and now it's up to him. Obviously, we'll "help" if he needs help in the future for whatever unforeseen reason, but it will be for essentials, not "lifestyle". We've put him into a position where he can fly as an adult and now it's down to him.