In our Department we have a UNIX machine for that. Since you will need to keep yout HTML files there, you need to know a bit about the rules UNIX uses to handle files and directories. First of all, you have to realize that a directory is also a file which helps to group other files together and which contains the list of files in that directory along with other information about those files. So, further on I will be speaking about files and that will also apply to directories. In UNIX any file has different permissions which specify which actions can be done with that file and who can do them.
Next question is who can read, write, and execute files.
To list the contents of the directory you do ls command. To get more detailed information about files you do ls -lg . To learn more about the ls command do man ls . To change the permissions you use chmod command. To navigate you use the command cd .