the worst blunder in chess 

tip: always double check if any pieces are hanging and tip 2: always look for checks captures and attacks for u and ur opponent so u do less blunders tip 3:dont always play like oo check it must be good final tip for today of i see any different issues for u ill write them anyways 5 tip : when ur pieces are attacked u dont always have to move ur piece and 2000 is pretty decent probably better then like 70-80% of players 6th tip: always in endgames try to put ur rook on 7th rank(not like ur opponent did but if nothings hanging) then put ur rook on the 7th rank bc its the most active there hopefully this helps u