If you write code…
Step 1. Find and edit every post you want to assign to a page and give them all either: 1) The same Category, 2) The same Tag or 3) The same post metadata
Step 2. On that page’s template or in a custom block or widget write a WP_Query that gets the posts (by tag, category or post meta) and displays them on the page in the format you want.
There are other solutions and even more if you are not a developer but that is the solution I think is the easiest if you know how to write code.