Simplifying, Textpack is a markdown file, plus optional image files, packed into single zip file.
You will find a short guide how to get started with Keepmark in the attached video.
Tags are one of the basic tools for organizing documents. When working with tags in Keepmark, you can start by defining a list of tags for a given workspace, or simply create them by assigning to documents right away. All tags assigned to documents will be visible in the application's side-bar, allowing you to quickly filter the list of documents to selected subjects.
You will find a short guide how to configure workspace synchronization in the attached video.
Work context is special view where you can preview your main document you working on, and at the same time browse other documents in workspace, or browse content in the web. It is specially useful when you making some research or working on your notes and you want to have convenient access to your other resources.
In Keepmark you can add relations for an existing document, to other documents, tasks, or people. This can be done through the side panel of an open document.
In Keepmark you can configure other external tools to work with. Mainly, I can be other applications, or shell scripts run for the selected document. Before you start you should configure them in Application Settings.
Keepmark has support for spell checking when creating notes. To enable this functionality, you must first go to the app's settings and download the dictionaries of your choice.
In Keepmark you can configure default author for new notes. It can be helpful, when you want to discover if note is created by you, or copied from external source. This operation you can do in Application Settings.