How can i add simple code in only in posts by function.php

there are many plugin which help me to add code to but it add on whole website on every page. Yoast Seo allos me to add code in head for specific post. But can i add code on all post by function.php?

Read more here:: <a href=https://wordpress.stackexchange.com/questions/310834/how-can-i-add-simple-code-in-head-only-in-posts-by-function-php target="_blank" title="How can i add simple code in only in posts by function.php” rel=nofollow>How can i add simple code in only in posts by function.php

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