On the page with the editable grid, https://anchovieshat.github.io/Q8/q8.html there's a table that maps numbers to instructions, and gives a brief description. It wraps below the grid to better support smaller screens. If you have a larger screen, you can expand the browser window, or if not, scroll down the page, and it should all be there for you.

In addition, once you have filled in the boxes a little, you can step through the code and the blue box under the grid will give you another, very brief bit on the instruction that your program counter is on.

Thanks for asking!