[HELP] I Need Some Help!! Please AND Thank You

So I have setup a custom php page called “blog-post.php” I can call each article by adding variables, for example:

blog-post.php?postid=10&type=singlePost

What I would like to do is call each post by “slug” so instead of the url looking like it does above, I would like for it to look like this:

blog-post.php?title=boosts-immune-system

I have scoured the internet looking for an answer and no one will help me can somebody please give me some assistance.