You can refer to the user experience: EVUS experience sticker.
2.F- 1, F-2 F- 1 student visa, F-2 his partner. F- 1 You can apply as long as you get i20.
3.H- 1B, H-4 H- 1B work visa, H4 his partner. H- 1B requires the company guarantor to draw lots and e-verification, and some non-profit organizations do not need to draw lots for H 1B visas.
4.L- 1, L-2 L- 1 work visa (internal transfer), L-2 his partner.