Work visa can be got through employers only. Either company in US should recruit you and apply for your work visa or company in your home country also can send you to work in US on a work visa. Depending on the requirement and your eligibility you will be issued a visa with which you get authorization to work in US.
To get a work visa you will need a work permit. When you get the work visa it will act as your entry visa to the country. So you will not need a separate visit visa.
How you can get greencard if you work with visa J1?"
Of course not. You cannot work in Singapore with a visitor's visa. This would be illegal. You have to apply for a Singapore work visa.
Yes. To legally work in Kuwait, you must have a valid Kuwait Work Visa, which is usually sponsored by your employer. Without a work visa, employment in Kuwait is not permitted.
Work visa can be got through employers only. Either company in US should recruit you and apply for your work visa or company in your home country also can send you to work in US on a work visa. Depending on the requirement and your eligibility you will be issued a visa with which you get authorization to work in US.
A "visa" is kind of like temporary citizenship. A "work visa" allows you to work in a country you aren't a citizen of, and a "visa" allows you to live there.
No, you cannot work on a B1/B2 visa.
No, you cannot work in the US with a tourist visa.
You should apply for a work visa in the country where you intend to work in order to work legally there.
No, it is not legal to work in the USA without a visa.
Yes, you can work on a B1/B2 visa.
No, a B2 visa holder is not allowed to work in the USA. The B2 visa is for tourism, visiting family, or medical treatment purposes only. Working in the USA would require a different type of visa, such as a work visa.