TIP: CHATGPT'S CUSTOM INSTRUCTIONS

Summary from the TLDR Marketing newsletter

ChatGPT allows you to add custom instructions that guide its responses, even on free accounts. These instructions act as an invisible layer of your prompt, letting you set your name, work context, and ChatGPT's personality traits, as well as specify writing preferences like style, tone, and banned words or phrases. To set them up, go to Settings → Customize ChatGPT, fill in the sections, toggle “Enable for New Chats,” and save. Adding prompt-style directions and prioritization notes helps ensure consistent outputs. Keeping a backup is recommended, as changes can dramatically alter results. This feature, especially with GPT-5, can significantly improve output quality.