Very informative article. I first came across BusyBox when I has dual boot system crash in 2020. I was familiar a bit with GRUB and when resizing partitions crashed my entire computer, I luckily got it back working again. Just in case you or anyone encounters similar issues, this is my reposting of the article recently. https://writerintheabyss.medium.com/unbootable-dual-boot-partition-resizing-guide-linux-b8bd66fab202