Please look into it and tell where I did wrong
Use something better like this:
https://f95zone.to/threads/rpg-maker-save-editors.51/
It will make it easier to decipher it all.
The first tab "Party" is where you can adjust experience points. If you give a level(s) up amount of experience, you will see it on status screens, but the level up won't occur until you win the next battle.
Second tab "items" is your inventory. You are pretty safe editing either tab.
After you get more comfortable using it, click the advanced tab. Stay away from "switches" for now and the near future, that is where you can kill your save, accidentally locking the file with impossible situations.
"Variables" is where you will find affection, pregnancy states, and the like, you can edit those pretty freely, but also has potential to miss things up, so be careful with it and backup your saves before attempting new things.
(To back up your saves, you need to make two identical saves in game, like spots 1 and 2. Then edit spot 2, because when you save the saveedit, it automatically saves over the save you edited.)