Linux adds sudo permissions to users and linux Users

Linux adds sudo permissions to users and linux Users
Linux adds sudo permissions to users:
Sometimes, if you run the sudo command in linux, the prompt is similar:
Xxxis not in the sudoers file. This incident will be reported.
Here, xxx is the user name, and thus the sudo command cannot be executed. At this time, the following solution is taken:

1. Enter the superuser mode. That is, enter "su-". The system will ask you to enter the superuser password and enter the password to enter the superuser mode. (Of course, you can also use root)
2. Add the write permission for the file. That is, enter the command "chmod u + w/etc/sudoers ".
   
3. Edit the/etc/sudoers file. That is, enter the command "vim/etc/sudoers" to enter the editing mode and find this line: "root ALL = (ALL) ALL "add" xxx ALL = (ALL) ALL "under" start "(here xxx is your user name), save and exit.
4. Revoke the write permission of a file. That is, enter the command "chmod u-w/etc/sudoers ".
   Then you can proceed.

In linux, if no user is a member of The sudo group and the root user does not have a password, is it possible to add a user to The sudo group?

What is linux? You can perform the following operations on ubuntu:

Restart, enter RecoveryMode, and select Drop to root shell prompt.
Then the root command line is entered.

Input: mount-o remount, rw/
Then you have the permission to modify the passwd file.

Input: usermod-a-G sudo yourUserName
The sudo group is added to the yourUserName user.

How can a Linux User have the permission to create directories and files?

Try sudo. Which linux system do you want to use? So many systems, some systems will be different ....