The Caps

Those of you moving from Windows to Linux also need to know about "capitalization"

In Linux, capital letters are "not" the same as lower case letter. In other words, Linux is case-sensitive.

Windows is (largely) case insensitive; Windows doesn't care if you type cmd or Cmd, ping or Ping, or if you name your folder Folder or folder, all these are the same.  The exception is with passwords, passwords are case sensitive.

Linux was created differently and intentionally encodes letters in ASCI text .. So, every letter in Linux has a different ASCI encoding.

In ASCI, an upper case letter is a differet character than a lower case letter.

Let me rephrase, with Linux an "R" is not the same as an "r"
In Linux, you can create a directory and call it "Music" and then create another and call it "music" and the system wont complain because these words are not the same.  In Windows you will get an error.

In summary,
Linux letters are encoded differently than Windows, and Linux is case-sensitive.

finis