Choose the input and position
Connect the microphone and check that Windows receives it. Select that input in the recorder. For voice alone, leave speaker loopback and other microphones unchecked.
Keep a consistent speaking distance, move away from fans, and avoid speaking directly into airflow across the microphone. Headphones help keep computer playback out of a microphone take.
Use gain carefully
Speak at your normal recording level and watch the input indication. Start around 100% gain. Raising a quiet source is useful, but too much gain also raises room sound and can distort loud words.
Stop the test and play it back. Make a placement or level adjustment before a long take.
Finish the file you need
Use the Windows app for trimming, separate source tracks and MP3, WAV or FLAC export. Save a session when you want to keep editing.
For a short single-microphone recording without installing the app, use the online voice recorder and download WAV locally.