The simplest option, and the fastest for capturing a thought before it escapes. Google Keep is a wall of colourful sticky notes: quick text, checklists, voice memos and photos, searchable and synced across every device through your Google account. It does not pretend to be a workspace, and that restraint is the point.
It is too lightweight for long documents or a knowledge base, and it lives inside the Google ecosystem. For grocery lists, reminders and quick capture that is always one tap away, few things are as frictionless.