Hi, I am new to this community and I am not advance in php.

I want to fix an error with a website link. The code in php shows below. I do not know if it is okay to post a website link here so I will not post yet.

Code:
<a href="<?php the_permalink(); ?>"><?php _e('full post ?','DailyNotes'); ?></a>

The code above shows a normal link however it is a blank page.
A normal link is similar to http://______.com/post/123.

A link which show the post is http://_____.com/?post=123.

Hence what can I do to the code above to add a question symbol and a equal symbol in the url link?