How do I start applying Python best practices for maintainable code?

[Jacob7]

I've been writing Python for about a year now, mostly for data analysis scripts and small automation tasks, but my code is starting to feel messy and difficult to maintain as my projects grow. I want to move beyond just getting things to work and start adhering to proper Python programming best practices, especially around code structure, documentation, and testing, but I'm unsure where to begin or which conventions are most critical. For experienced developers, what resources or guidelines helped you most when transitioning to writing more professional, production-ready code? How did you incorporate practices like type hints, virtual environments, and unit testing into your daily workflow without it feeling overwhelming, and are there any specific tools or linters you consider indispensable for enforcing consistency and catching bad habits early in the development process?