I actually have my whole home directory like that for that reason haha

bin - executables
dev - development, git projects
doc - documents
etc - symlinks to all the local user configs
med - pictures, music, videos
mnt - usb/sd mountpoints
nfs - nfs mountpoints
smb - smb mountpoints
src - external source code
tmp - desktop

~/dev/, with project/org subdirectories

If you’re trying to have password auth be a second layer on top of key auth (requiring a password after connecting with your ssh key), you can add the following to your server’s sshd_conf:

AuthenticationMethods "publickey,password"

/dev/sda is the whole raw disk - you typically don’t want to directly interact with /dev/sda, unless you are partitioning or overwriting it. There are a few layers between that device and the files:

• raw disk - /dev/sda
• disk partition - /dev/sda1
• luks container - when unlocked, mapped to /dev/mapper/{name}
• ext4 filesystem inside the luks container, mounted somewhere like /mnt, /media, etc

You’ll need to find where that ext4 filesystem is mounted, and run the chown command on that. You can run lsblkand see a tree of the above hierarchy, with the ext4 filesystem’s mountpount shown in the right-hand column.