For me it is a convenient and compact tool in which I can put all my ideas, goals, thoughts
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
Evernote - Bring your life's work together in one digital workspace. Evernote is the place to collect inspirational ideas, write meaningful words, and move your important projects forward.
Notion - All-in-one workspace. One tool for your whole team. Write, plan, and get organized.
Google Keep - Capture notes, share them with others, and access them from your computer, phone or tablet. Free with a Google account.
Slack - A messaging app for teams who see through the Earth!
Joplin - Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. The notes are searchable, tagged and modified either from the applications directly or from your own text editor.