Best ways to keep notes about my site's development

Question: What are the best ways to keep logs & notes about my site’s development for myself, devs & designers

Background: When building complex websites there’s a lot of notes I log regarding the site’s development progress, system design, procedures, decisions, & thought processes re why I chose one way over another.

So far: I’ve roughly noted things in a notes app, but it’s accumulating & not sustainable long term, when needing to search & find specific things, for myself & others.

The notes could be organized by webpage or topic or date, I’m open to learning best systems people use. I’ve only built sites on site builders, & am a noob coder. I wonder how other wix devs & devs that don’t use builders manage this area. I searched online for this without knowing if there’s a term for this. What systems/software are used for this? Is there a way/tools for what I mean, within Wix that can be seamlessly integrated? Or with a 3rd party?

Working in Wix Editor

After more digging, I found this area is related to topics like ‘Architecture Decision Records’ & ‘Project Documentation’. As I’m an avid Obsidian user, I think I’ll use a separate vault for this. I can use it with its canvas where I can view with different levels of depth, & organize it by topic or webpage, while having it linked with its different areas like a wiki. If people have feedback or suggs I’m all ears