I'm new to all this and need to know the definition of a lot of work

What is Kegel/kegels/kegeling mean? Please some 1 tell me? I’m Green new to all the words and meanings of them can any 1plz tell me what bdsm means too? Thank u for any help u can give

Kegels are " repetitive contractions of the pelvic muscles that control the flow in urination in order to strengthen these muscles especially to control or prevent incontinence or to enhance sexual responsiveness during intercourse"

For BDSM, read this article: https://www.hercampus.com/school/app-state/bdsm-dummies