Many sites over optimized with keywords have got hit by the Florida update. So, what things should I keep in mind while optimizing on-page factors?

I am seeing that sites with no links or very low quality links are also getting pretty shaked due to these updates. After the Florida updates I though that everything will be stabilizing but now it seems to be just the opposite.

So, I read some really good reviews about a link provider in another forum. And I thought that I will give it a go. Now, while when I am buying  a link or two from the vendor. He keep insisting that I should buy also a couple of medium quality links (DA around 25-30). He is even saying that even if I don't buy the medium quality links from him. I should definitely get them from someplace else. I asked him why is that. So, he told me that the link which he is providing me is of high value and comes from a page which wouldn't put links in it if the referred page isn't much popular. So, what should I do?

Note:- Please people who don't have any actual idea don't post here.

I blocked my website on robots.txt for the search engine due to maintenance. Now making backlinks for my website is a good idea or not. Will my website authority affected due to block in robots.txt?

What is the sandbox effect?

Hello friends,

How many ranking factors does Google use?

Some sites charge way more then usual market price. I am having this issue. These sites usually sell direct ads and not via any third party service. Why is that?

Which field has more prospects according to you guys? If anybody has to choose a career between these two then which one will be more better than the other.

I have found my links through SEMrush but how to know which links are of low quality?

What is the best way to find Content Copywriting clients?