Error:

QueryException in Connection.php line 713: SQLSTATE[42S02]: Base table or view not found: 1146 Table 'user.category_posts' doesn't exist (SQL: insert into category_posts (category_id, posts_id) values (4, ))

solution

It seems Laravel is trying to use category_posts table (because of many-to-many relationship). But you don’t have this table, because you’ve created category_post table. Change name of the table to category_posts.