LGBT is the Lesbian, Gay, Bisexual, and Transgender community. This has been around since the 1990's. It is important because it gives people the chance to be accepted with people that are similar to them. It is supported by people, organizations, and social movements.
Someone affected by these can find help in support groups and resource centers. To be educated about this it may be taught in school or the internet is very useful. Not only can these places help but you can ask around to people you know and trust. Everyone is open to having their own opinion.