LTSB is short for long term support which is an enterprise release of Windows 10 that comes with pretty much none of the Microsoft's bloatware that is normally loaded into other versions of Windows 10. That also means no Microsoft Edge, Instead it will have Internet Explorer as its default browser. and again no Store apps support at all.
I've installed it on my old Thinkpad X220T along side Arch Linux and my aim was to use Linux as a primary OS and keep Windows 10 just in case I needed it. But I ended up using Windows 10 LTSB as my primary OS. it is very fast and responsive. And most importantly it is so lightweight. The battery life of the laptop has greatly increased compared to the professional version that I used to have. Oh yeah and the best feature No Windows updates(only the security patches).
There are few caveats tho(for me). the LTSB comes with Windows 7 calculator, photo viewer, Internet expolorer, and No voice recorder. I actually do use MS Edge for viewing PDFs and I like the new calculator app because of its support for dark skin and I got used to the new Photo Viewer. Unfortunately none of these can be installed on LTSB release. not a deal breaker but they're a bit aged and feels retro to use them.
it is free to download from MS website with an evaluation period of 90 days.
Just wanted to share my experience with you guys.