LFS as a learning experience

I plan to install LFS on a spare SSD on my framework 13 (ryzen 9 AI, got em plenty of cores for compiling), what should I expect to learn from the experience? What ISO should I use as a basis (I was told the gentoo ISO is a good start)

And also for successful LFS veterans, is LFS usable for reviving old laptops and being a huge flex while doing so?