What are the requirements for working in the United States? How many years can I stay in the United States? Is it illegal work or something else?

It depends on which visa you use, tourist visa is not allowed, it is considered as illegal work

The US tourist visa you apply for is only for visiting the United States. You cannot hold a tourist visa for sightseeing there. Working in the United States. Although it is said that you can find a job in the United States with a tourist visa, working in the United States with a tourist visa is equivalent to working illegally, which is illegal. Once found, you will be deported and will not be allowed to enter the United States for 10 years, so you must be careful if you want to work in the United States To work, you must apply for a corresponding work visa.

If the applicant wishes to go to the United States to engage in prearranged professional and technical work, he should apply for an H-1B visa. This type of visa requires applicants to have a bachelor's degree or above (or equivalent) in the professional field in which they are preparing to work. USCIS will review the applicant's employment background and personal qualifications to determine whether they meet the professional skills requirements. The applicant's employer should submit a labor status application form to the U.S. Department of Labor, including the terms of the contract between the employer and the employer. When there is a shortage of local U.S. workers, U.S. employers can recruit foreign citizens to the United States for short-term agricultural work through the H-2A visa. If you want to engage in temporary/seasonal agricultural work in the United States for a short period of time, you can apply for an H-2A non-immigrant visa.

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