Using Links in your article is usually a good practice, you are providing a extra information. This helps a reader to understand the article. If your anchor text and the link provided are relevant then there should be no problem with that and using proper keywords for anchor text and relevant link is a must.

However, its not advisable to include backlinks on your article body text instead you can include the backlink on the resources or Author bio. Maximum of three links can be included. For blogs you can include 2 backlinks , if it contains 300 words. If its 1000 words, you can include around 3 to 4 backlinks with different landing page. And please do not stuff your blog with keyword and backlinks.