Need help to edit my travel videos

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Hello friends and fellow enthusiasts

I have been shooting travel videos with my phone with an HD set. While recording, I give the voiceover myself.

I have never done much video editing myself. I used to upload my short videos on YouTube and used the built-in editor to do some basic changes. Presently, that facility is not available anymore in YT Studio.

I need to do the following things:

1. Stabilization.

2. Colour and contrast correction (global)

3. Sound enhancement including noise removal, amplification etc.

4. A little trimming (sometimes). I generally shoot short videos.

5. Voiceover (if required).

6. Slow motion (on a part of the video)

Could someone with experience please guide me to a free software/ free web platform where I may perform these and it does not have a steep learning curve?

Please understand, I do these purely as a non-commercial venture and I have a full-time job. Hence I am unable to devote a lot of time, even if I wished to.

Thank you.