Wordpress - is a gallery possible without plugins?

Question

Gallery

Hello!
There was a problem. I myself am not very versed in the intricacies of the WP engine, but as far as I remember, you can’t make a gallery in standard ways, you need plugins for this.
How to implement it at the template level?
The thing is, I'm going to hire a programmer to do my design, but I can't design the gallery tab properly. The news feed is already used by the main news page, so the option to insert a screenshot in the thumbnail will not work. I saw examples on themeforest where, in addition to news, there is a separate portfolio page, but I don’t understand how this can be done.
Thank you.

Answer 1

Here is an example .