I am extremely new to photography

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Almost all photos need to be edited. If nothing else but, to correct the exposure. Here an example:
 

Here I corrected the exposure, shapened the photo and cropped to the Rule-of-Thirds.r

The shots you are sharing give me a sense of serenity and peace. You are feeling and that’s #1 on my list.

Understanding what you’re doing is the easy part.

First things first. Absolutely 100% shoot in max size raw. It’s not just how to process, the order in which you do things is important too. Invest the $20 a month in getting Adobe Photoshop and Lightroom. There are many other options, some free but Adobe gives you more than anyone.

Find yourself a mentor!!!!  Today with YouTube and social media you have plenty of options. 

I would put off shooting stock at this moment, and replace that with increasing the number of shots you’re making by a factor of 10. I assure you’ll be getting better as you work on creating a library of images to start submitting in a couple of months.

Feel free to send me a private message, and I’ll send you some photography basic lessons if you need and or want to understand more.

Great work, don’t stop!

Editing is important. There are different ways to treat even the same image. At the very least, however, bringing out details in the shadows and highlights is a top priority.

Hello,

Being new to photography and stock photos, Adobe’s Creative Cloud help has some good articles on creating stock photos:

Help

https://helpx.adobe.com/stock/contributor.html

https://www.adobe.com/creativecloud/photography/technique/composition.html?x-product=Helpx%2F1.0.0&x-product-location=Search%3AProduct%20Information%3Alink%2F3.8.2

https://helpx.adobe.com/search.html?q=composition&context=https%253A%252F%252Fhelpx.adobe.com%252Fstock%252Fcontributor%252Fcontent-moderation%252Fquality-technical-standards-reasons-content-refusal.html

You do have to be careful with exposure:

https://helpx.adobe.com/search.html?q=exposure&context=https%253A%252F%252Fhelpx.adobe.com%252Fstock%252Fcontributor%252Fcontent-moderation%252Fquality-technical-standards-reasons-content-refusal.html

This will be a start!

Adobe Stock checks for blown-out highlights and crushed blacks in photos.
While I think it is unavoidable for the sun to appear completely white, I suspect the image was rejected because the mountains and trees in the foreground lost all detail in the shadows—becoming completely black.

Simply brightening the dark areas in Lightroom can change the impression of the image.

Using HDR Merge in Lightroom allows you to obtain photos that are resilient against blown-out highlights and crushed shadows.

https://helpx.adobe.com/jp/lightroom-classic/help/hdr-photo-merge.html

If you are interested in landscape photography, you should also look into the "rule of thirds" composition.

Since explaining everything here in the community would take a lot of time, I recommend searching for books or websites that cover shooting techniques and RAW processing.