Question about citing research for blog posts and web articles.

I want to know how to cite research when writing a blog post or article on a website.

I am trying to create a micro-niche site to promote affiliate products.
I want to write some articles to give my site content.
But I want to make sure I don't break any laws like plagiarism, copywrite, etc.

If I research information and find some from another source (blog post, article, website, etc.) and use it to help write something like an article or blog post how do I give credit without legal trouble?

Do I just put citations in the bottom or do I need to have permission from the owner of the source?
Are there any tools or websites I should know about to learn more about this?
I couldn't find what I needed online but thought I'd be better off just asking real people who have done this before.

Sorry if this is the wrong place to ask.

 

Here is a link for you to read. The "Fair Use" section covers what you are interested in, for the most part:

https://smallbusiness.findlaw.com/business-operations/is-it-ok-to-copy-material-from-a-website.html