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Web speed
Most important books about webspeed.
https://www.amazon.co.uk/High-Performance.../dp/0596529309/
https://www.amazon.co.uk/Even-Faster-Web.../dp/0596522304/
https://www.amazon.co.uk/Professional.../dp/1118487524/
https://www.amazon.co.uk/Web-Performance.../dp/1617293776/.
More listed on Yeahub.
The WP Speed Matters blog is also a great resource, which can be found here: https://wpspeedmatters.com. With regards to plugins, the ones I use most are W3 Total Cache, Asset CleanUp Pro, ShortPixel AI, Flying Pages. I might also experiment with Flying Scripts. I will be serving HTML through Cloudflare and static assets through BunnyCDN