Digital index cards offer the same simplicity as paper ones—with powerful searchability added. I first explored this in my guide on creating index cards in Microsoft Word: How to Make Index Cards in Microsoft Word 2016. The key drawback of physical cards? No easy searching.
Reader William Caldwell shared a brilliant tip in the comments: use a single Excel column as your searchable database.
I favor Google Sheets for its free access from any device. No spreadsheet expertise needed—it's straightforward. Here's how William does it:
How to Make Index Cards in Microsoft Word 2016 Index cards are one of the best information organization tools and memory aids because of their simplicity. Design your own with Microsoft Word and these tips. Read More
These codes enable quick sorting and grouping. Search beats flipping through a stack of cards every time. Create yearly files for ongoing tracking.

Tag any info with codes or keywords. Practical applications I've used or recommend:
My go-to sheet pairs book ideas with personal life areas (like motivation). Scan rows or sort instantly for targeted insights.
Too basic, or have you adapted this for specific info like recipes or contacts?