I would like to thank you first for giving me tips to improve my work.
As you can see I'm not an English native speaker so that why my English is so bad and broken.
About the data file, I already export the file without the unused file but for some reason, when I looked into the file folder there are many resources that unused got export too (example: sound that I never use / some character and enemy art)
Next about the plugins that you give (I'm using the MZ maker is it possible to use any MV plugins into my MZ Maker ? or only some MV plugins can support the MZ maker?) I'm really new to plugins so I do not know much about any of them or how to use them properly.
About the sound effect the "opening chest sound" I think its default (that's how the RPG MAKER prepare it) sometimes I just too afraid to mess with the default setting, I afraid something may cause an error.
About the fight yeah, I already send the file to my friends for the prototype test, they say that enemy is to OP and hard to defeat because enemy health is too tanky. So I reduce enemy health and increase a bit of MC damage.
(I could recommend having two separate dialogues per NPC. Especially the ones that sell your goods. It will become very repetitive always having to "sit through" the same dialogue..) about this, I doest understand what you mean(because of my bad English) or I don't know how to do this. (if you could link any youtube source that will be helpful)
The image that you show yeah, I want to remove it but keep forgetting thanks for the reminder. It supposes to be a door that lock and you have to find the key/lever to unlock but it's too complicated for me(Noobs). so I remove the door and forget to remove the event
About the tile, so you saying that I have to show (particle) on witch tile that the item(potion, etc...) (but if it at random places and if player lucky enough they can find like secret OP item)*spoiler
The map I use is all preload(Provide by RPG MAKER) since I doest know how to make my own map.(yet)
Thanks again for finding my mistake and giving me tips to improve the game