Software Engineering E-book download link:
https://www.mlsu.ac.in/econtents/16_EBOOK-7th_ed_software_engineering_a_practitioners_approach_by_roger_s._pressman_.pdf
https://app.diagrams.net/?libs=general;uml#
YouTube UML Tutorial Link:
https://www.youtube.com/watch?v=gUEizau0-UQ&list=PLWPirh4EWFpF9Gbnu4_DdF4ITHSN6MSsk