There's a lot of ways you can download Youtube videos. I will share what I am using. I used YTD or Youtube Download, you search it via Google download it. It's exclusive for Youtube videos only. I am using an extension for my browser Firefox and Chrome, you have to go to the settings in your browser and select Manage Extensions. Right there you add or removed any extension you like. For downloading video look for Video downloader and add it to your extension. Once it done, you can it on top of your browser an arrow pointing down. You can download any videos, even movies you like wherever sites you visit. To used it, just play the video you want to download, any available video will show up on the arrow right on top of the browser, click it and choose which video you want to download. Once it finished, it will automatically saved to your download folder in your computer.