Answer 1

Frontend development: HTML, CSS, JS (a.k.a. Web triangle)
Backend development: SQL, PHP, Python / Ruby.

The above-mentioned languages are basic needs of web development!

Answer 2

That depends on what you're trying to achieve.

⏺️For any kind of website related works:
1.HTML
2.CSS
3.Javascript

knowledge on the above three is required as basic.

✨For web development: Start with HTML, and then move on to CSS, JavaScript, Python,jQuery,, and SQL.

Or

HTML,CSS, jQuery,SQL,PHP

or

🐍Python3 and Django for building strong and very rich website ( flask is used for small website,but Django for everything)

✨For general application :
programming: Python, C++, and Ruby; then Java, C#, or Swift, based on the platform you're targeting.

➡️For details:
https://www.sololearn.com/FAQ

🔷Here is a very rich video, detailed (step by step) guidelines for starting online Career ( learning Web Development and other Programs):
⬇️⬇️⬇️
https://youtu.be/Zftx68K-1D4

🔼🔼Watch the above video attentively and then decide yourself.

⏩⏩A very good reference:
https://www.sololearn.com/Discuss/284542/?ref=app

⏬⏬By August Mein:⏬⏬
1. Choosing your first Language

You can choose any language.
if you can't decided here the guide :

HTML is used to make web structure.

CSS is used to give style or animate web

JAVASCRIPT is used to make dynamic web (you can even make game)

PHP is server side scripting language

SQL is database manajemen in server side

C++ is multiplatform OOP based programming language (you can make many app including Games)

C# is more spesific (windows os) than C++
Java is used to build app that can run on any devices (including Android). JAVA is not JAVASCRIPT

Python is multiplatform OOP based programming languages with easy syntax (compared to other OOP Language)
Swift is for building apple / IOS app .

https://www.sololearn.com/discuss/1033194/?ref=app

https://www.sololearn.com/discuss/1062064/?ref=app

Answer 3

You can also refer to

www.sololearn.com/faq

Answer 4

Mainly 3 languages;HTML,CSS and JavaScript
HTML:used for making the content of the website
CSS:used for styling the content and the website
JavaScript:used for specifying the behaviour of the website e.g what would happen if you click a certain button on the website etc
Other languages could also be used but that is on a more higher level

Answer 5

PHP,Python(Django),Ruby(Ruby on Rails)

Answer 6

HTML is the sort of the boss, followed by CSS and JAVASCRIPT