Object oriented programming languages like Java, python.
Learn Java and python from W3Schools website.
Learn database management system conceptually and also learn SQL from W3Schools website.
Learn JavaScript from W3Schools website
Learn HTML and CSS from W3Schools website
Learn MongoDB from W3Schools website
Learn Data science and machine learning tutorial from W3Schools website
If you are interested in web development then you should do HTML5 CSS bootstrap WordPress JavaScript from W3Schools website
If you are interested in analytics then you should learn data science and Google analytics
If you are interested in becoming a developer then you should learn Java or Python and you should definitely learn SQL.