Nobody cares about them.
Probably the only person that will read this post is you, who just typed in your search bar “how to write your first blog post” and ended up here because the title is quite catchy. As you just did, your target audience is most likely to type the topic they want to read about and then decide which result is more accurate. The truth is, nobody cares if its your first or most recent post, the important thing is the quality of your copy.
“You never get a second chance to make a first impression…” so you better write every post as if it was your first.