Here's a useful video on the topic:
By default, it displays the last lines when used in the following form:
tail [filename]
tail -n 11 [filename] -> Last 11 lines
tail -c 20 [filename] -> Last 20 characters
We can also specify a certain number of lines to be displayed and list multiple filenames as well. It may also be used to display a specified number of bytes from an input file. Click here for more details about using the tail command.