Question: how to download video by youtube?
Answer: Get 4K Video Downloader. To download YouTube videos to a Windows PC, start by downloading and installing 4K Video Downloader. ... 
Copy and paste the video URL. ... 
Choose the quality and format. ... 
Download the YouTube video. ... 
Try Smart Mode. ... 
Install TubeMate. ... 
Choose a video to download. ... 
Download the video.