If you marry a U.S. citizen, getting a Green Card is usually the fastest and most common way.
Having close family in the U.S., like parents or kids who are citizens, also helps a lot.
Some jobs, especially for highly skilled workers, offer quicker Green Card paths (like EB-1).
Investing a large amount of money in a U.S. business (EB-5) is another route, but it's costly.
Winning the Green Card lottery (DV) is possible too, but it's luck-based and not guaranteed.
Your country of origin also matters some countries have longer wait times than others.