Native shopping ads

What are your thoughts about Native shopping ads from Amazon? Also; is it best not to do the automatic ads and just place ad code in the txt of your posts and have better control of what goes in and where?

I don't know much about them and fearful I will get something I'm not happy with. I once had the Google Adsence put ads on my website at random, they ended up showing across the middle of my site which broke it up and made it kind of ugly and the ads were not relevant to my niche. I couldn't figure out how to fix the problem so just shut it off. My niche is about food and products around food and I ended up with car ads. I'm not super savvy with this technology and worry that I will break things. I do break things. Not meaning to, it just happens.

Any training you can direct me to? I'd be much appreciative for any advice one can give me.

Thank-you,

Athena