Bit rate, also known as ‘data rate’, is what controls the visual quality of your video and its file size. When you’re editing your video, you should choose a ‘variable’ bit rate if your software gives you that option, and follow this as a guide:
If your video is SD, choose a bit rate between 2,000 – 5000kbit/s
If your video is 720p, choose a bit rate between 5,000 – 10,000kbit/s
If your video is 1080p, choose a bit rate between 10,000 – 20,000kbit/s
If your video is 2k, choose a bit rate between 20,000 – 30,000kbit/s
Feel free to experiment with different rates if your file is too large or you’re not happy with the quality of your source file.