Obsidian is a free (non-commercial use), not open source, text editor and works with open standard Markdown formatting on plain text files.
Apart from quite advanced editing and UI options, I find Obsidian attractive because of its over 500 quality community plugins, and its ability to visually show the relationships between your notes. Recording notes from meetings, or as you are daily learning new things or solving problems, is an excellent way to build your personal knowledge base. Using Markdown format can be fun, and can achieve a lot in terms of readability when you use some of the more advanced features of Markdown formatting.
Despite not being open source, you are not locked into Obsidian, and can use other Markdown editors interchangeably. In my video, I also touch on integrating with NextCloud to sync your notes, and especially some issues that iOS presents for apps.
Watch my video at https://youtu.be/q_4LR76g-jU
#technology #obsidian #markdown #notes #editor