Setting up a personal wiki or knowledge base in Notion can be a great way to organize and access information quickly and easily. Here's how you can set up a personal wiki or knowledge base in Notion:

1. Create a new database: To create a new database for your wiki or knowledge base, click on the "+" button on the sidebar, and select "Database." You can also use pre-built templates from the template library to get started quickly.
2. Define the properties: Once you have created a new database, you'll need to define the properties of the database. Properties are the columns in the database and can include things like page titles, keywords, and categories.
3. Add pages to the database: After you have defined the properties of the database, you can begin adding pages to the database. Each page represents a single item in the database, and you can add as many pages as needed.
4. Organize your pages: Notion allows you to organize your pages using a variety of methods such as nesting, linking, and tagging. You can also create a table of contents for your pages and organize them by categories.
5. Customize the view: Notion allows you to customize the way the database is displayed. You can change the layout of the database to see the information in different ways, such as in a table, calendar, or board view. You can also add new columns and properties as you need, move and sort the columns, change the font, add color, and change the way the information is presented.
6. Utilize the search function: Notion's search function allows you to find information quickly and easily. You can search for pages by keyword, and you can also filter your search results by category or tag.
7. Sharing and collaboration: You can share your wiki or knowledge base with others and collaborate with them. This can be useful when working on a team project, or when sharing information with clients or customers.

A personal wiki or knowledge base in Notion allows you to organize and access information in a way that works best for you. With the ability to customize the view, utilize the search function, and share with others, you can create a highly customized and efficient system for storing and finding the information you need. Additionally, by utilizing the tagging, nesting, linking and categorizing options, you can create a hierarchical structure to your pages, making it easy to navigate and find the information you need. Overall, by setting up a personal wiki or knowledge base in Notion, you can improve your productivity and save time by having all the information you need in one place and easily accessible.