How to show Google Adsense after the first post on Blogger home page (mobile and desktop)?

Google Adsense is the preferred advertisement platform for most Bloggers. It is very easy to implement. It can be added to the Blogger site in so many ways. But basically, in three ways -
1) By choose to auto display ads by Blogger
2) by adding the Adsense code in HTML/JavaScript widgets or
3) directly adding in the Blogger template.