There are many online tools for this purpose but they have disadvantages. For example you can't download big video. Here is a good instruction "Want to save YouTube videos?" https://www.movavi.com/support/how-to/how-to-download-video-from-youtube.html This guide applies to both the Windows and Mac versions of the program.
I think 2Conv is easy to use. It is a free online tool, which is able to save YouTube videos in MP3, MP4, and AVI format. If a certain video cannot be downloaded by 2Conv for some reason, I would use Joyoshare Screen Recorder I installed before as an alternative to record videos in 1080p without restrictions. Just to add, you can get up to 70% off to buy the program now. Some of my friends also recommend 4K Video Downloader and Freemake Video Converter. You could try many if necessary.
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Tested ko na yan.