Standard Notes

If your workflow revolves around notes, then there's a good chance you might feel the need for something more than what typical note-taking apps have to offer, in which case, Standard Notes might just be what you were looking for.
Right off the bat, we want to make it clear that Standard Notes is by no means an impressively-equipped note-taking app. However, it ticks enough right boxes to make it worth your while.

Your notes in the cloud, protected and readily accessible on all your devices

For example, it stores your notes in the cloud, it makes sure that your privacy is as protected as possible by encrypting them, and it's incredibly easy to use and to get started with.
It's also worth pointing out that it comes with clients for the most popular OSes out there such as Windows, macOS, and Linux, as well mobile platforms like iOS and Android. To make things even better, there's also a web-based app which allows you to access your notes on any device that does not have the bespoke Standard Notes client installed.
As mentioned before, the app is quite intuitive, and that's mainly thanks to its simplicity-orientated UI and a simple set of features. You are also provided with a very usable and easy way of organizing and searching for your notes, with the help of hashtags.
If you're still longing for something a bit more feature-packed, you can always go for the paid Extended version of the app, in which case, the app is upgraded with features like note version history, automatic backups, and lots of other extensions like editors and UI themes.

Goes to show that simple features and a well put-together package can be enough

Of course, you are required to first register an Account directly from the app's main window in order to benefit from everything it has to offer (like synchronization on all devices and encryption), otherwise, you will be dealing with a humdrum note-taking app and not much more.
Taking everything into account, Standard Notes is a very useful application that may seem a bit too feature-deprived for some, but the fact of the matter is, it has a lot of good things going for it.
Yes, it may not be the most stylish, and the most customizable, and clearly, it does not offer a comprehensive way of organizing your notes, but, really, if it's just about taking notes and keeping them safe while being able to access them on all your devices, then this app is just right.