explain meaning of sudo in linux command?

sudo(super user do) command is used to execute commands with elevated(root user) privileges

how do you create a folder in linux?

The syntax used to created a folder/directory in linux is mkdir

how to check the current working directory?

The command used is pwd - Present working directory

differentiate Absolute and Relative Path

Absolute path gives the complete path of the file/directory location from the root directory. Relative path gives the location in reference to the present working directory

how to change the current directory to previous directory

In linux - cd ..