How can I find RSS feeds of popular websites and blogs in my niche?

Google top blogs:

Search Google for "top [niche] blogs". Example:

top weight loss blogs

top marketing blogs


Google specific domain RSS:

If you have found a specific domain, you can even Google "domain rss feed". For example:

searchengineland.com rss feed

WordPress:

If a site is built with WordPress, add "/feed" to the end of the URL. Examples:

example.com/feed
example.com/blog/feed
blog.example.com/feed

Blogger:

If a site is hosted on Blogger, add "feeds/posts/default" to the end of the URL. Example:

example.blogspot.com/feeds/posts/default

Tumblr:

If a site is hosted on Tumblr, add "/rss" to the end of the URL. Example:

example.tumblr.com/rss

Medium:

If an article is hosted on Medium, add "/feed/" before it's name. Example:

Article URL: medium.com/example

Feed URL: medium.com/feed/example

Other sites:

Some sites use the following structure: example.com/rss/index.xml. For example:

theverge.com/rss/index.xml

RSS icons:

Visit popular sites. If you see the image below on them, click on it:

Source code:

This approach is a bit more technical...

Visit a website.

Right click on a blank area and select "View Page Source" or "View Source Code".

Click "Ctrl+F" and search for "RSS" or search for "atom".

This should help you find the RSS feed URL.