How many do-follow links we can use in one article ?

It depends on the length of article.but if you use more than two links then it is frustrated the reader it leads to not clicking on any link

You can add as much as link in your article but make sure all the links are from different website, because if you use 2-3 links for the same website then Google will take a reference of only first link of the article.

Ex-- If you use an link at the first paragraph and again you use same link or other link of with same domain then Google will accept take as a reference of the first link only...

1-2 links is enough for an 400-500 words article.

short and sweet is what catches my attention, then I'll click on links

Actually that depends on length of your article. The less the better.

I personally like to base the number of outbound links from my articles on the size of the article.

If the article is less than 500 words I like to limit links to 1 out of site link and one to other articles on the site.

Above 500 words: 2 outbound links, 2 - 3 internal links.

If you stuff your article with too many outbound links it may be viewed by search engines as link farm which they can penalize.

Good idea Neha thanks for sharing.

2 Links 1st is your website link like xyz.com and second is your off page activity link

usually 2 links for 500 characters

Thank you so much to everyone

I use the link in the article 3 of 500 characters

It's totally depend on article length. & 2 links is enough in 1 article.

Yes, two quality link is ideal

Maximum 2 links......................

No more than 1-2 because Google will penalize you for breaking SEO rules.

Good idea, thanks for sharing.

One or 2 is ideal; more do follow links are a distraction and woo away potential readers.