Domain age: You must need a Custom domain. Such as .com, .net, .org, etc. But recently Blogspot's free domain is being approved. Your domain or site age should become 30-35 days old.
Content quality: you must need unique articles. You can't think of getting Google Adsense approval without unique content. So, your articles must be unique. Then you need 30-35 unique articles on your websi01
The number of Articles: Apply for AdSense after posting at least (30-35 Posts) on your website. All posts must be unique. You have to keep this in mind.
Page of The website: You must have some pages on your website Which is are,
i. About Us
ii. Contact us
iii. Privacy policy
iv. Terms & Conditions
These pages must be located on your website. Without these pages, you can't get AdSense approval. So you have to keep these steps in place on your website.