I use a combination of methods. For notes that I want to keep and reference later I use Google Drive docs because it provides reasonably advanced formatting too

I use a combination of methods. For notes that I want to keep and reference later I use Google Drive docs because it provides reasonably advanced formatting tools, ability to insert images, and has tools to export in multiple formats. For short or temporary notes and lists I tend to use Google Keep. I like these two tools because they are available on and sync with my phone.