Answer 1

programming language are of different types you can choose as your concern like
From the FAQ:
That depends on what you're trying to achieve.
For web development: Start with HTML, and then move on to CSS, JavaScript, JQuery, PHP, and SQL.

For general application programming: Python, C++, and Ruby; then Java, C#, or Swift, based on the platform you're targeting.
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Re: https://www.sololearn.com/faq/#q1