Lab 11.1 - my /dev/shm is not tmpfs [SOLVED - it`s normal]

This is normal. Exactly what is on tmpfs filesystems depends on your distribution; you did not mention what that is. For example on my (RHEL 7) system:

$ df -h | grep tmpfs
devtmpfs devtmpfs 7.8G 0 7.8G 0% /dev
tmpfs tmpfs 7.8G 152M 7.7G 2% /dev/shm
tmpfs tmpfs 7.8G 9.1M 7.8G 1% /run
tmpfs tmpfs 7.8G 0 7.8G 0% /sys/fs/cgroup
tmpfs tmpfs 1.6G 40K 1.6G 1% /run/user/1000

You can have multiple tmpfs ramdisks mounted in fact as shown above.

I've yet to see a distribution that doesn't use /dev/shm, but it's not essential to have it. Also note they are really not 7.8 GB in size here (which is half of my RAM). they are allowed to grow to that big but the size is dynamical.