Need help with youtube

There's an app called Youtube Studio, maybe you can use that on mobile. It lets you see & reply the comments without having to open the video itself. It'll send notifications to your phone as well whenever there's a new comment.

Sorry for my bad english and noob reply.
But for my personal use i go https://www.youtube.com/account_notifications then i enable chrome notify (there is a button on that page for do it) and also "Notify me when someone interacts with my videos" and i enable push&email too,then when someone write a comment on my videos i receive email\notification.
p.s. in the setting of chrome browser you must also go Java and add Youtube to the allowed websites,must do the same for notification too,because if you not do this also if you enable all on youtube page then is not work because chrome not allow it (if you have block all by default).
i use youtube for more more years and i work also with it but sincerely i'm ok with this setting i not need any additional software,addon or anithing.