Which is the most reliable and up to date knowledge resource that I can study and get started with Amazon PL in US?

I’ve tried a few and I always think I would miss something and would lose money.

Any tips and things to avoid when starting?

Thanks

I believe that learning alone is never enough if you are just starting you might need a support system an expert to manage things for you
This will be less risk when your product is researched by a reliable expert who knows ins and outs of amazon
My name is abyaz and i m a woman founder of agency amzexpertagency.com
I have been working on amazon stores since 2018
Did 700+ amazon launcheshad been the representative of different amazon agencies in usa and australia
Now i m running my own agency where i help sellers by managing their brand and store
If you need help
Here are my details and link of my client reviews
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