If you’re not familiar with this term, you should be.
“Beta reading” is the entire concept that this page is predacted on.
According to Wikipedia, “A beta reader (also spelled betareader, or shortened to beta) is a person who reads a written work, generally fiction, with what has been described[1] as “a critical eye, with the aim of improving grammar, spelling, characterization, and general style of a story prior to its release to the general public.”