BTS are a seven-member group from South Korea who debuted on June 13, 2013. Their name in Korean is 방탄소년단 – which means Bangtan Sonyeondan and translates to Bulletproof Boy Scouts. Their fans are known as ARMY. Originally focused on hip-hop, over the years BTS have diversified their range and produced a vast array of music (and a lot of other content, too). When it comes to BTS, there's basically something for everyone.
In terms of following the band, there are several platforms to check out, depending on what you're interested in. The seven members share one Twitter account, @BTS_twt, which they use for personal updates. They also use the app Weverse for sharing posts and photos and interacting with fans, while the VLive app is where they livestream.
BTS' YouTube channel, Bangtan TV, is where behind-the scenes clips, dance practices and video logs are dropped. More recently, they've also been livestreaming logs on YouTube.
BTS' Soundcloud is where you'll find a whole bunch of music the band has released for free, from pre-debut songs to solo tracks and mixtapes to covers of their fave artists.
The band has an official Twitter, Instagram, and Facebook, all of which are updated by staff and used primarily for official announcements and photos.
New video content tends to come with English subtitles, and livestreams are typically subtitled within a day or two. But Google translations for social content are basically never accurate, so it's a good idea to follow fan translators who collectively provide almost instant translations. Here's a Twitter list of some fans who regularly translate BTS content from Korean to English.