How to add to link other post in Wordpress

I am new to wordpress, I have searched this thing on net but unable to find exact solution.

I have created a post that contains the Actor's Profile and the list of Movies Actor has worked in. Each Movie has also a different Wordpress Post that contains Movie details.

Now i want to create a link on each Movie, by which user can view the details of that particular movie.

This following link gives the result

<a href="http://localhost/wordpress/2015/10/09/movie-main-page">

but if i add this in each post, then it would be very difficult for me in future, when i will be uploading the site on web server, to change each link individually on every post.

I believe that there must be some way out there better than what i doing here, but somehow i am unable to find that trick.

Kindly guide me.

Thanks

via Chebli Mohamed