Custom Fields are the way of enabling authors to store meta-data against an individual post / page in Wordpress. If you are doing more than just basic data storage / display with custom fields in Wordpress, the list of links in this post will be of great interest to you.
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Solving a custom field query quandry
Storing the details of a rideshare offer / request lends itself well to custom fields, especially when More Fields is used for data capture. I found a solution to a complex display challenge: How to display a set of posts based on multiple custom field values? This post demonstrates get_post_meta_multiple, a function you could include in your theme to allow you to filter based on an infinite number of custom field key / value pairs.
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