You can edit and update an article when it's necessary.

It’s fine to add or update content in your post if you don’t change your keyword.
If it’s a big update of an old article then indicate the date you updated it

It's actually a good thing to update content every now and again. That way google sees it as new content and gives it new indexing.

You can change as much as you like but be careful it can have 2 effects it can push you up or down the serps.

If making changes take a snap shot of where it's sitting then check in two months to see where it sits, if it's up great if down then revert back or change again.

Changing a word here or there won’t make a difference.

I understand this to be good practice. I seem to remember one of the videos was about reusing past content. I most certainly am not an expert but I hope this helps
Stephen

I agree, I always edit in WP and add images there.

As Diane said, I do edit some articles in WordPress after publishing from the site content.

Hi - any changes have to be made directly in WordPress once a post has already been published.

Good suggestions below. Depending on what you are promoting you can start getting affiliate links and using them immediately. Like it was mentioned Amazon is going to want to see that you have content already on your site. So it depends on what you are doing and what you are promoting.

Mel

Hi

Your site need be ready and have some traffic before you apply for affiliate programs.

Hello. My advice would be to follow the training. Good luck.

I would say 25-30 good quality posts!

Jeff

I’ve never had an issue with affiliate links as long as your content is relevant and good quality. Don’t overthink it, put them in where and when it feels natural. You shouldn’t have an issue with it.