While you can't easily set ChatGPT Search as a default search engine in most browsers (which you maybe shouldn't do, anyway), you can still create shortcuts to quickly and easily search anything ...

Structure content for AI search so it’s easy for LLMs to cite. Use clarity, formatting, and hierarchy to improve your visibility in AI results.

Google execs Liz Reid and Nick Fox explain how the company is rethinking everything from search results to advertising and personalization.