Finding and Copying to External Disks

Type sudo fdisk -l

This lists disks.

I got the former disks, plus /dev/sdb1

How to copy /home/marcin directory to /dev/sdb1 ? Is that the path? What is the difference between path and TOSHIBA EXT? What is mounting a disk?
What is the path of external disk, and what is difference between path and /dev/sdb1 ?
What does it mean to mount a disk? When you 'mount' something you are placing access to the file system contained within onto your root file system structure.
Is an external USB mounted autmatically in command line? Sometimes. If not, mount it by creating a mount point and
What is a filesystem? Filesystem format?

Linux Admin 101