This one is less featured by Workflowy is where I’ve been keeping notes for about five years.

It’s basically just a huge infinitely nested bullet list. They’re adding more features now but I don’t use them.

It’s good for:

• Making a plan to reach an objective. Each node can have an infinite tree of subnodes, so tasks you’re unsure how to complete can be broken down again and again until it’s all five-minute chunks.
• recording knowledge. For me at least the tree structure works well for writing down details, then caveats and exceptions on the details, etc.
• interlinking the knowledge. You can type (( then it opens up search for any node text with autocomplete. Once you pick the other node, that node is hyperlinked to your current spot and the whole subtree exists there. One thing that’s useful for is if I have a list like “my tasks today” and then each item is a task that exists as a sub task of a sub task somewhere else.
• retrieving information. The search is fast. I’m good at standardizing my own language so I often know what exact wording I would use. So if I have a product idea I can search “product idea: waffles made of …” and it will find that exact idea from the last time I had that idea and forgot