It would be especially useful to review the manual pages or any documentation on the following resources:

• ls(1) - lists files.
• apropos(1) - lists commands that have a given term
• unzip(1) - unzips zipped/compressed files
• uudecode(1) - decodes file.
• tac(1) - flips the text within the vertically.
• tar(1) - manages archives
• rev(1) - reverses lines of text.

a place where data is collected, preserved, managed, and made accessible to those with permission; although many are public.