How to change default file permissions in Linux?

How to change default file permissions in Linux? umask with full details.

• #education
• #umask
• #umask_value
• #how_to_change_default_file_permissions_in_linux
• #default_permissions
• #umask_command
• #changing_default_permissions
• #bash_profile_umask
• #umask_file_permissions
• #user_masking_value