APEX youtube links to learn

 https://youtu.be/_9RJD5tVeHo?si=ASp9L6EgpA02dWza

https://www.youtube.com/watch?v=ahlW-Jkumto&list=PL_c9BZzLwBRJXk2hEP-U_OUMJAf_TYEiZ