ServMask | Clone and backup sites.
ServMask | Enable import & export on Multisite.
ServMask | Enable import & export large files. Better to be ready at hand.
WebDevStudios | Add video URL on post content, and featured image will be auto-generated. Essential for video-based websites.
Jan Willem Oostendorp | Default featured image. Essential.
Elementor.com | Page builder.
Namogo | It's post widget can customized using custom template and it has smooth carousel post widget.
Kevin Dees | Displaying youtube videos in it's right ratio. Essential for video-based websites.
weDevs | It has powerful slides and awesome features in general. Must install.
42Theme | Simply add loading bar. It has 'tickle' feature that is really helpful for UX.
Doc4 | This fix the issue where favicon is not showing on sub-site(s).
Never Settle | Copy sites on multisite easily.
One Designs | Useful when combined with Automatic Post plugin (set YouTube channel as author). Note: Add the avatar manually.
Mark Jaquith | It gives option to redirect posts and pages. Must install.
Really Simple Plugins | Make sure your site(s) is directed to https://. Must install.
Colorlib | Really useful to series type of posts. Better to be ready at hand.
Google | Only activate it when the site is ready to be published.
SuperPWA | Only activate it when the site is ready to be published to avoid CTA without an app icon.
ValvePress | Recommended for each site that has a blog. Note: For YouTube Auto-update posts, API required.
Soflyy | Backup posts in Excel .CSV format.
Soflyy | Enable import Excel files that contain scraped data from Youtube. Also very useful for importing blogs and series from other posts.
Team Yoast | Essential. Remember to fill default meta data on Dashboard > Yoast SEO.
yotuwp | Add channels or playlists without importing their data to server. YouTube API required.