I used several tools (trello, offline notepad like apps, regular notepad, Google docs, todoist, to do list, wunderlist, etc...) and the easiest/fastest fór mne

I used several tools (trello, offline notepad like apps, regular notepad, Google docs, todoist, to do list, wunderlist, etc...) and the easiest/fastest fór mne is Google keep. It works on both Pc/mobile and your can make several checklist fór different projects