How to add unique update field into post of wordpress

I use the blog page to update my products details.
I need to edit different price in each post of WordPress.
It is not in title and text body, i created another div for the price.
Please check the attached image.

I tried to use customer fields of the post, but it needs to setup post ID in the variable, so every new post will use the value of first post ID.

what kind of things i can use in here to update price easily.
I am the beginner of php, so is there anything coding i need to do in content.php? or any plugin i can use in GUI to update price value.

enter image description here

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