how do I get a specific post from a post with a subcategory in WP

all of this code is running on the index. php. example: category 1 has 5 subcategories;
the subcategory 2 of category 1 has 8 posts and two of these posts have three tags, that will be used in my code as an identifier for the initial page within a wall of 5 posts to display these posts from the aforementioned subcategory and another 2 posts from another specific sub category

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