I would suggest learning html first as that is the basic for webpage development and then progress on to json and so forth.
Just like C & java is the basic for coding & programming.
It could be due to the Android version of the phone is not supported by the game. I download one such game but since the game was old it did not have Android 12 compatibility and also game black screen but when I tried it on an older phone it worked.
It is just my opinion but in Tekken Series - Monstrous Ogre & Jinpachi Mishima were stronger and had more unblockable combo moves than Heihachi or Kazuya or that weird Tekken 6 Bird monster boss.
similar situations happens atleast once a month for me. At first I used to get worried and try to keep full attention on everything I did to make sure I didn't mess up but it was tiresome so I gave up saying it's just me so can't change it.