course bundle and subsection with courses

Hello!

I got 4 certification levels (course bundles) with different modules (courses) under it. The number of courses under each certification level may vary.

At the moment the courses are published on the time they were published. However, just like the other sorting options, it makes it a big mess as some courses/modules are added later to different certification levels/course bundles or have names that are not on alphabetical order etc. So it becomes a big mess. Therefore, I would like to structure it for clarity. 

Thus, I would like to make the course page to look as follows:

course bundle (big, parallex)
the 3, 4, or 5 courses (that include it under it, in number they may vary, in sections next to each other)

so it would look like:

| bundle 1 |
|1 | 2 | 3 | 4|

| bundle 2 |
|1 | 2 | 3 | 4 | 5|

| bundle 3 |
| 1 | 2 | 3 |

| bundle 4 |
| 1 | 2 | 3 |

How can I do this?

I cannot figure it out somehow, thanks for your help!

Also, a complicating factor is that I have customizer ID so cannot link to them even if I would build the page from scratch.

Besides, I would also like to change the link name to the course page, instead of courses something like modules or certifications or getcertified, how do I do that?

Thanks for your help! Highly appreciated.

The page I need help with: [log in to see the link]