Take notes. Keep a journal. Clip anything from the web. Evernote lets you store and share information quickly and securely. - Evernote
Evernote is the app I use most on a daily basis. To take notes of everything, even handwritten stuff just gets pictured and imported into Evernote. The basic plan which is free is enough for me where I can synchronize data between two devices and even if using more than two devices I use the web app for it where some functionality is limited like searching in only one notebook for example is not possible. What’s your most used app on a daily basis?