The authuser=0 parameter tells Google which signed-in account to use. If you have multiple Google accounts logged in (e.g., personal and work), authuser=0 means .
The parameter authuser=0 is a standard Google technical indicator that you are viewing the profile for the first (default) Google account currently signed into your browser. Purpose and Functionality https wwwgooglecom search contributions profile authuser 0
We sampled 200 search results across five query categories (product queries, local services, news topics, academic queries, and creator/author searches). For each result we recorded presence of profile links, author snippets, rich results, and structured metadata (schema.org author, publication date). personal and work)