Just do a google search on-line for "autolisp tutorials" and select Videos on the top row and there are tons of them like these series:
https://www.youtube.com/watch?v=kofj18DbcXc&list=PLwqMD67__ep39iFjt1vBLs7MJMbKfnHz0
BEGINNER AUTOLISP - LESSON 1 - INTRODUCTION
https://www.youtube.com/watch?v=kofj18DbcXc
BEGINNER LISP - LESSON 2 - APPLOAD & CREATING A LAYER
https://www.youtube.com/watch?v=yD1BYFeEJeo
BEGINNER LISP - LESSON 3 - IF STATEMENTS INTRO
https://www.youtube.com/watch?v=eb4fhcoe9o0
BEGINNER LISP - LESSON 4 - OUR FIRST LISP PROGRAM
https://www.youtube.com/watch?v=V4JN7x9HXHQ
BEGINNER LISP - LESSON 5 - SETQ & PROBLEM SOLVING
https://www.youtube.com/watch?v=oVwzZ1OfRtU
BEGINNER LISP - LESSON 6 - PASSING VARIABLES TO FUNCTIONS
https://www.youtube.com/watch?v=83m4QELQB_Y
BEGINNER LISP - LESSON 7 - AUTOLISP PROGRAM IMPROVEMENTS
https://www.youtube.com/watch?v=nhStz5qCuEw
BEGINNER LISP - LESSON 8 - APPLOAD REFRESHER & FINAL REVISIONS
https://www.youtube.com/watch?v=Doy0D52I1JY
Or this one on AutoLISP Basics:
https://www.google.com/search?sca_esv=a5908d9afcf34126&sxsrf=ANbL-n7ut97o0B1KrdWx0EAcyi70Pb6-jA:1769...