I recently bought a cheap mic from banggood and a cheap soundcard from ebay and whenever i record there is a high pitched screeching noise in the background. Please help.
I could make a blind guess, but better if you could post a short audio sample to demonstrate the problem.
Record a few seconds with you talking, and include a few seconds of just background noise. About 5 seconds total will be ideal. Export the recording in WAV format.
See here for how to post the sample to the forum: https://forum.audacityteam.org/t/how-to-post-an-audio-sample/29851/1