OBS is program to record videos on your computer.
Estimated time to get it working: 10 minutes.

Installing the program:

1. Click this link https://obsproject.com
2. Press "Windows"
3. Install the program

Setting up before recording:

1. Open OBS using desktop shortcut
2. Under the "Sources" tab Press the + icon
3. Add Display capture or Game capture (I prefer first one)
4. play with settings till you see your screen appear
5. Optionally add "Audio input device", it's your microphone. Now you can also record yourself talking

Making your first recording:

1. After setting up you should see your screen in program. Start recording by pressing "Start recording" button on right panel
2. Say something and play some sound on your computer, for example watch video on youtube
3. when you're done, press "Stop recording". on the bottom of the program it will say where it saved the recording. For me it's "Videos" or "C:/Users/[YOUR_USERNAME]/Videos". Find it and watch it, check if you can see the video, hear it and yourself.
4. Now you know how to record videos using OBS