If something piques my interest, I generally go to the Wikipedia to get a Big Picture idea. If it's interesting enough, I branch out from there. Of course in may case, I'm print-oriented, so in general YouTube is a "from there" of last recourse.
I have 3 to-do lists, not counting the one in my Evolution email client. Well, 4, counting Google Calendar for far-off dates.
The priority one is TaskWarrior, which allows arranging stuff by priority and age among other things. It's a command-line desktop app, although I set up a process that sends me an email copy of the list each morning.
The second one is Gnotes, which is a Linux (Gnome) "sticky note" program with hyperlinking. This one runs on the GUI desktop.
The final one is Joplin, which is similar to Evernote. It's first and foremost a note-taking/organizing app, but I have it synced between my desktop machine and various devices so unlike the other two, it travels with me both near and far. It's also hosted on my own server, so I don't have to keep "secrets" on someone else's machine.
And when I'm in a suitably perverse mood, I'll ignore all 3 and do what I please.