It depends on your J-1 visa status; if you're subject to the two-year rule, you'll need a waiver before applying for a green card.

Yes, you can apply for a green card on a J-1 visa, but you may need to obtain a waiver if you're subject to the two-year foreign residency requirement.

Possibly, but J-1 visa holders often face additional hurdles, such as the two-year home residency requirement, which may require a waiver to pursue a green card