In the first 3 sentences both 'click' and 'click on' are Alright, but why use the phrase 'on' when It isn't necessary? Inside the 4th sentence 'click on in this article' sounds Odd. Preferable is: "Click below ..". keen to the sneakers, the size from the shoes (13), comparison to https://alexisqcnwg.blogocial.com/click-no-further-a-mystery-52710581