help built-in function

help()

# object passed
help(list)
help(dict)
help(print)
help([1, 2, 3])

# string passed
help('random thing')
help('print')
help('def')

from math import *
help('math.pow')

When a string is passed, provided string is looked up as the name of a module, function, class, method, keyword, or documentation topic.