Typing code is not like typing prose: half of the work is brackets, quotes, operators and indentation, and the other half is editing. Klava trains both.
What you can practise
Real code in JavaScript, TypeScript, Python, Java, C#, Go, SQL, Rust, Kotlin, Swift, PHP, Ruby, C++, Dart, HTML/CSS and frameworks like React, Django, Spring and Laravel.
Endless code: fresh lines generated every time, so you never memorise the text.
Symbol course: brackets, quotes, operators and arrows step by step.
Code editing: Vim motions and editor shortcuts with a shortest-solution hint, plus find-and-fix bug drills.
Your own code: load files from a public GitHub repository or keep a library of snippets to learn by heart with spaced repetition.
Tab autocomplete like in an editor, and naming drills for camelCase and snake_case.
Why it pays off
Developers type all day. Typing symbols without looking and editing without the mouse saves minutes every hour and keeps you focused on the problem instead of the keyboard. Start with your main language, then try Vim practice or Python typing practice.