If you want to track the growth of COVID19 in a country not on this list you can use a web site, the Wayback Machine, also called the internet archive, to find the older versions of the worldometer web page on COVID19. These pages will give you the older statistics for each country.
Here is the link to the index page for the older versions of worldometer's COVID19 page.
To find the final statistics for a day hover over a date, a menu will spring up listing all the times they took a snapshot, click on the last snapshot. Recently this has been taken about ten minutes from the end of the day.
I have noted that the last figures for the day are still up on the first archived pages for the next day. The numbers seem to be exactly the same. So the numbers on worldometer may not be exact, but they stick with them any way.
Perhaps there is another source that allows you to get the numbers without all this work. If so please share it with us.
Here is an example of what you can do with this data. This gives you the first two weeks and a day of growth of deaths in Korea. The two weeks start on February 19th and go to March 5th. The first number is the new deaths for that day, the second is the total as of that day.
I have found another important site with COVID-19 data that you can use this WayBack Machine technique with. This website has the country by country data on how many tests have been preformed. You can put the URL in the WayBack Machine yourself, or you can use the this link to the relevant index page on the WayBack Machine.