The second and subsequent ones.
WHY IT IS EASIER
The concepts transfer. Only syntax, libraries and conventions are new.
WHAT TO ESTABLISH FIRST
How this language differs from what you know: typing, memory, concurrency, error handling.
WHY THOSE
They shape everything else.
WHAT TO LEARN QUICKLY
Syntax, from a concise reference rather than a beginner course.
WHAT TO LEARN PROPERLY
The idioms: how experienced practitioners actually write it.
WHY
Writing one language in the style of another produces code that works and reads badly.
WHAT THAT LOOKS LIKE
Loops where comprehensions belong Manual iteration where the standard library provides it Patterns from another ecosystem imposed unnecessarily
WHAT TO READ
Well-regarded code in that language.
WHAT TO LEARN ALONGSIDE
Its tooling: package management, formatting, linting, testing.
WHAT TO BUILD
Something real, using its conventions.
WHAT TO EXPECT
Productivity within days, fluency within months.
WHAT NOT TO DO
Conclude a language is bad because it differs from what you know.