Anti bot protection

Hi, I'm learning web scraping and have mostly practiced on sites like Books to Scrape and Quotes to Scrape. I'm now trying to understand how experienced developers approach scraping real-world websites that have rate limits, changing page structures, and anti-automation measures. I'm not looking for ways to bypass protections. I'm more interested in the engineering side of things. For someone moving from practice projects to production-grade scraping, what would you recommend learning next? Specifically: • How do you research a website before building a scraper? • What are the biggest mistakes beginners make? • How do you design scrapers that are reliable long-term? • What tools or resources helped you learn crawler architecture, monitoring, data quality, and maintenance? Any advice