3.5's skill system wasn't robust. It was an easily breakable mess with too many overdefined skills. The skill point system was garbage, because it was tied to INT and d20+N is too coarse of a probability distribution to allow tinkering without breakage.
A typical 5e skill covers 2 or more 3.5 skills. If your level 1 Fighter is just a typical warrior, he might have +2 to teach of:
Athletics, Acrobatics, Animal Handling, Survival, Artisan's Tool
In 3.5, this would be
Balance, Climb, Craft, Escape Artist, Handle Animal, Jump, Ride, Survival, Swim, Tumble, and Use Rope.
Five of those aren't class skills, so to get to +2 in all of those, you'd need to spend I think 32 skill points.