I would like to move some space from a Windows partition (sda2) to a Ubuntu partition (sda5 or sda4?). However, I'm a novice in setting up partitions and the bootloader.
From other questions, I've seen that the partitions can't be mounted when messing with them. For this, people advised using a live USB with Ubuntu or with GParted. People have also mentioned using Windows for resizing its partitions (and disabling fast-startup) and GParted for Ubuntu, afterwards. However, beyond this I don't know much else. I know that stuff can break if the offset of the boot partitions changes and I don't update the bootloader, which I don't know how to do. Do I have to deal with this in this case? I ask this because sda2 and sda4/5 are consecutive. Are there any other caveats I should look out for?
A smaller question I have is why is sda5 alone inside sda4?