Welcome to Macaulay2
Try entering '2+2' at your next input prompt, which begins with i. The two output prompts begin with o. The first one, with the equal sign, '=', gives the value computed from your input, and the second one, with the colon, ':', tells what type of thing the value is.
Type one of these commands to get started reading the documentation:
copyright -- the copyright
help "Macaulay2" -- top node of the documentation.
help "reading the documentation" --
help "getting started" --
help "a first Macaulay2 session" --
help x -- show documentation for x
help about x -- show documentation about x
help about (x,Body=>true) -- show documentation mentioning x
? f -- display brief documentation for a function f
printWidth = 80 -- set print width to 80 characters
viewHelp -- view documentation in a browser
viewHelp x -- view documentation on x in browser
To read the documentation in info form, in case you happen to be running Macaulay2 in a terminal window, replace help by infoHelp in any of the commands above.