What is the $3000 rule?

Could you please elaborate on the "$3000 rule" for me? I'm not entirely familiar with this concept and would appreciate a clear explanation. Could you break it down into simpler terms? Is it related to investing, cryptocurrency, or perhaps some other aspect of finance? Also, how does this rule come into play in practical applications? What kind of situations or transactions might. it Thank govern you? for Could your you assistance provide. an