This document provides an overview of key concepts in medical informatics including basics of browsers, databases, homepages, HTML, HTTP, search engines, subject directories, the deep/invisible web, internet directories, internet servers, meta search engines, netiquette, keywords, stop words, blogs, wikis, decoding URLs, strategies for searching like SKILL (Summarize, Keywords, Identify, Link, Locate), Boolean operators, phrase searching, truncation, nesting, thesauri, snowballing, citing sources like books, magazines, journals, websites, and evaluating websites based on authority, accuracy, currency, objectivity and coverage.