Источник: Хабр frontend

• https://www.edx.org/course/css-basics
• https://ru.code-basics.com/languages/html
• https://htmlacademy.ru/courses/basic-html-css
• https://ru.code-basics.com/languages/css
• https://fructcode.com/ru/courses/javascript-and-jquery/?pref=69448
• https://stepik.org/course/2223/promo
• https://practicum.yandex.ru/web/
• https://beonmax.com/courses/html-and-css/
• https://netology.ru/programs/html-css-base

Источник: Хабр

backend

• Hyperskill
• https://www.edx.org/course/introduction-to-java-programming-starting-to-code
• https://stepik.org/course/187/promo
• https://ru.code-basics.com/languages/java
• https://java-programming.mooc.fi
• https://javarush.ru/
• https://stepik.org/course/67/promo
• https://ru.code-basics.com/languages/python