Actually, at the end of an F1 visa, provided that you got a degree, you can work under OPT for 12 months, with a possible 17 months extension if you're in STEM.

Actually, at the end of an F1 visa, provided that you got a degree, you can work under OPT for 12 months, with a possible 17 months extension if you're in STEM. At the end of those (12+17) months you can seek H1B.