[Q]: Objective: To mix butter and eggs together, you can
[A]: Use a whisk to thoroughly mix them

[Q]: Objective: To fix a doorknob.
[A]: Unscrew it from the door with a screwdriver and re-assemble it, ensuring the proper connections for the knob and lock if applicable are in place.

[Q]: Objective: how do you polish something?
[A]: go over it with wax

[Q]: Objective: How to sound better while singing
[A]:
Practice singing every day and be sure not to eat dairy before singing.