new to video editing

I hope you're paid! 😉

Yes, both Adobe Express free and Premium editions on Windows desktop allow you to export a single frame from a video. Simply upload your video, navigate to the desired frame, and use the export frame feature.

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Initially, when I started with video editing, I found Adobe Express's ability to export a single helpful frame, especially as a beginner. It was a feature I frequently used for creating thumbnails and specific images from videos.

Not really but there is a way,
Take your video at the moment you need the still to show (place the play head at the right place)
Drag the mouse and select everything in the frame, at that exact moment. Copy (CTRL+C)
then add a page, same size and paste everything. You may have to add a background colour as this cannot be pasted.
You obviously get a video, but one that doesn't move.
Now download your project (just the one selected) and choose a PNG, PDF or JPEG

You got your still!

You can try to simply place the playhead and decide to download here and then (without copying, pasting on a new page) but I found it didn't work out the exact moment for me. But it can be a solution too!

It works for me, maybe there is an easier way...

AFAIK, no.

1. Pause video. 

2. Use your computer keyboard's Print Screen (PrtSc) function key to grab a screen capture.

3. Paste contents into a document with Ctrl / Cmd + V. 

4. Crop as needed.

Hope that helps.