Thanks @Leo for mentioning Notion. I’ve installed it on my iPhone and iPad and it’s exactly what I’m looking for to keep notes and to do lists with better organisation than Google Keep.
Yeah Mikah and I are big fans. He uses it for the iOS Today rundowns. One nice feature is that any page can be a web site. Great for sharing information. I keep stuff in there to answer questions. For example here’s my supplements page (people often ask me about Steve’s recommendations):