Difference between /Home and /home?

With /Home you are probably referring to what in Nautilus is signified with 'Home'. The name of this folder actually is not "Home". This folder is named /home/ in the filesystem. /home is the folder which contains all the users Home-folders. (Which explains why you need sudo to do anything there.) /home/username is the personal folder of that user.

So, you can type cd /home/ and press tab to see which options you have (or if you're the only user it will autocomplete your username). ls /home will list all the files and folders in /home. If you have anything there, I would highly recommend moving it to your personal folder, since that's much cleaner.

Faster ways you can cd back to it, are cd (without arguments) or cd ~ (with a possible path behind it, like ~/Pictures )