Here are some websites that are super useful:
To watch sumo:
https://www3.nhk.or.jp/nhkworld/en/tv/sumo/
https://www.youtube.com/user/Kintamayama
Other stuff:
https://tachiai.org/
https://twitter.com/sumokyokai
www.reddit.com/r/Sumo/
To watch sumo:
https://www3.nhk.or.jp/nhkworld/en/tv/sumo/
https://www.youtube.com/user/Kintamayama
Other stuff:
https://tachiai.org/
https://twitter.com/sumokyokai
www.reddit.com/r/Sumo/