When creating blogs, it’s always wise to add both internal and external links - it should really help your SEO!
The primary goal of this is to improve navigation, help search engines understand your site’s structure and provide additional information to readers.
We recommend that you add a maximum of:
2x internal links
1x external link
The reason for this is that you want to strike the right balance between providing value to your readers, and not being spammy by adding unnecessary links. Too many links may confuse readers and distract them from the main content.