sftp setup to restrict user to some /path

WHY?
– Secure access
– Secure path

adduser kool -s /sbin/nologin

#edit /etc/ssh/sshd_config and ADD

Subsystem sftp internal-sftp
   Match User kool
   ChrootDirectory /opt/dir1/dir2
   ForceCommand internal-sftp
   X11Forwarding no
   AllowTcpForwarding no


chown root:root -R /opt/dir1/dir2
chmod 755 -R /opt/dir1/dir2

chown kool:kool /opt/dir1/dir2/kool
chmod 700 /opt/dir1/dir2/kool