The summary.
STICK WITH YOUR FIRST LANGUAGE UNTIL YOU ARE COMPETENT
Switching repeatedly means learning syntax three times and concepts never.
Build something you actually want, from the start. Concepts learned without application are forgotten within days.
Confusion is the normal state, and it passes.
FOR AN ADDITIONAL LANGUAGE, LEARN THE DIFFERENCES FIRST
Typing, memory, concurrency and error handling shape everything else. Syntax comes from a concise reference, not a beginner course.
Then learn the idioms — writing one language in the style of another produces code that works and reads badly.
WHEN READING UNFAMILIAR CODE, START WITH THE TESTS
They document intended behaviour in examples. Then trace one path from entry to output, rather than reading everything superficially.
Get it running and make a trivial change before attempting anything real.
ADOPT THE LANGUAGE'S FORMATTER IMMEDIATELY
Consistency across a codebase is worth more than any individual preference, and it ends style discussions permanently.
CHECK THE VERSION ON EVERY PIECE OF DOCUMENTATION AND EVERY ANSWER
WITH AI ASSISTANCE, NEVER USE CODE YOU COULD NOT EXPLAIN
You will need to debug it, and you cannot debug what you do not understand.
