Discovery and research process for new project

I’m in the “discovery and research” phase for a project I am mulling over. I’ve just been throwing links and notes into a Google doc as a place to track all the articles, podcasts, online communities, etc I’ve been visiting. I’m thinking about switching over to something with a flexible structure like Trello to better organize stuff but I also don’t want to over complicate the process. What apps do people use to organize useful information during the discovery phase? Thanks for your input!