2+ Categories, 1 Page

This is an interesting idea. Have you considered using tags as well as categories?

Personally, I would leave the category pages alone rather than customizing them and tag all posts within cat 1, cat 2, and cat 3 with the same tag then link to the tag page wherever you were going to link to the combined category page.

Hopefully this makes sense and helps. Let us know either way we are here to help if this solution does not work for you we will find one that does!

I don’t want to alter the category pages, I just want all the blog posts that would be in cat 1, cat 2 , and cat 3 to show in page 1. This is because my blog covers sooo many different types of topics, I want people who are looking for a certain type of posts to be able to go to a page and just scroll through all of that “type”, like all of my posts about crafting to be under one instead of going to each individual tool review, tutorial, etc. I want people interested in a general topic to be able to go to that general instead of having to look at specifically tutorials, reviews. That’s too specific for me. The tags I use are usually more specific and every time I add a new one, I’d have to edit the page code. I want to set up the categories before, add them to the code, and just leave it.

It is the I am still not certain I understand what you are trying to do. Personally I would look at using tags.
Tags and Categories are not the same thing and both create a page for posts that fall under them.

I have looked through your site a couple times now and it is not clear to me what your categories are or whether you are using tags. It might help me to better understand if you provide me a list of your categories and an example of ones you want one of these custom pages to combine into a single page. Hopefully my request makes sense, if not feel free to let me know and I can try to reword what I need in order to help you better.

Looking forward to your reply!

I have tags and categories. 2 of my categories are video game news & reviews, and tech and internet news. I want those two to show up on a page like “nerdy info”. They have different tags. I assumed categories, since I preset them, would be simplest.

Ah ha. Okay, I think you just need some custom archive templates added to your theme with custom query_posts statements set to show the category IDs accordingly based on which page you are on. These should created in a child theme.

the query_posts statements should look something like this.

<?php query_posts('cat=5'); ?>
<?php if ( have_posts() ) : while ( have_posts() ) : the_post(); ?>
   <?php the_content(); ?>
<?php endwhile; endif; ?>

When you name the custom archive templates be sure you do it in a child theme and name each file differently. Also, keep the portion at the top that is commented out with a title but slightly modify each title. Then go create a new page under the pages area and create new pages for each template you just created. Be sure to select the appropriate template (this is why you will want to slightly modify the template name line so you can tell the difference in this drop down between each one!) under page attributes on the create/edit page screen.

Hope this helps. Feel free to post back with further questions. I am happy to help further if you need more clarifications and if I am not around someone else here may chime in and help. Good luck!