What are the requirements for applying for a British visa and a Schengen national visa in Ireland?

Ireland is not a Schengen country. You need to apply for a visa in any country you love, including Britain. If you love going to other countries, you need to apply for a visa at the local embassy. You need about nine things, such as your hotel reservation, air ticket, passport, visa for more than half a year, photos and so on. And then you can come down in about 2 weeks, usually 2-6 months. But if you have a visa from a Schengen country, you don't need to go to other Schengen countries. You can go to France, Germany, Spain and other countries, and you don't have to sign it again, but not in Britain. It seems that the only countries that don't need visas in love are Northern Ireland and Switzerland. Good luck.