It’s using the Chinese rules, prisoners don’t matter.
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You need to read just a little deeper…
You don’t need to take the 2 stones with D1. After W-F1, B-E1, if W-D1 (captures E1), then B-E1 (snapback, captures 3). Instead, play somewhere else that increases your score.
Likewise, after W-J5, B-J6, W-H6 (captures J6), B-J8, you don’t need to play J6 to capture H6 and J7 until White forces you with W-J4. White can’t connect with J6 first because it’s self atari. Instead, play somewhere else that increases your score.
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Sorry for the late response. Thank you so much for your helpful advice. I recognize that I need to study this topic. Unfortunately there is no option to skip puzzles 
Sorry for the late reply. Thank you for your kind help.
I am glad to see you are still on the journey of learning Go. Hopefully, you found the journey enjoyable.
I am curious though, after all these times, how much do you find the HJJ Go apps help you in these 2 months of using it, and which part of the function do you feel is more helpful (practice with humans, practice with AIs, tsumego, opening practice, end-game problem, or just their videos if you watched any)? Do you feel you gained some knowledge, or better (or worse) at certain aspect?