Prompting Guide 101 - Google Gemini; color-coded prompting guide; and discover practical examples of using LLMs with Google Workspace, including Docs, Sheets, etc.
Prompt Engineering by Lee Boonstra; alt: Kaggle White Paper Prompt Engineering; excellent guidelines;
Learn Prompting website; very comprehensive list of prompting techniques, applications, patterns, etc.; MUST review
Open-meteo: free weather API