If you delete any videos on your channel, the associated data with the videos such as watch time, views etc. will also be removed. Also, you can learn how to grow your channel at YouTube Creator Academy. Here's the link: https://yt.be/help/3R2h . Hope this helps.
@TeamYouTube i have a question what happen if i have 200 videos in my channel
And i delete 100 video
Is it affect on my channel if yes then please explain how
Any tips to grow
Because i think i am making good quality videos and content according to creators academy 
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