More & more content is being added to hanguk.app.
At the end there will be at least 8 chapters, 50 guides, 20 vocabulary lists and more grammar explained within the lessons and in separate cheatsheets.
We are currently at around 25% of the final content.
There are some errors (mostly typos) that will be corrected as we add more and more content.
The final bits of content should be on the website by the end of 2022, 2023 will mostly be upkeep and fixes (no more content is scheduled for now).
Thank you for your understanding.
We wish you the best in this long journey of learning Korean; visit suyeon.org for more info on who we are and our mission.