You can use OBS Studio to create recordings of your entire screen or specific windows. To get started you'll need to do a little bit of setup. The first thing to do is set your recording options. Then you'll set up your canvas with what you want to record.

When you open OBS Studio for the first time, you will want to set a few recording options for the best results. You'll only need to do this once.

1. Hit the Settings button in the right pane of the window.
2. Click Output in the left pane.
3. In the Recording section:
   1. Set the Recording Quality to High Quality, Medium File Size.
   2. Set the Recording Format to mp4.
   3. Click Apply.
4. Click Audio in the left pane.
   1. Set the Channels to Mono.
5. Click Video in the left pane.
   1. Set the Common FPS Values field to 20.
   2. Optional: Set the Output (Scaled) Resolution to be the same as the canvas resolution if you don't want the output video to be shrunk down.
6. Click OK and then exit and restart OBS Studio.

To start recording video you need to specify a capture source.

1. Under Sources in the main window, click the plus button to add a source.
2. Select Display Capture.
3. In the Create/Select Source window, click OK.
4. Optional: Select the display for display capture. Otherwise click OK.
5. You should now see a preview of your screen in OBS.

Once you've set your recording options and capture source(s), you can hit Start Recording to begin. When you're done, click Stop Recording. A video will be saved in the Videos folder in your Documents folder. Whenever you exit and reopen OBS, it will use the settings you used last time.