Writing a comparative is not a big deal!!
Comparative is coming from Compare Word. That means is only a comparison between two or more things it has similarities and differences too.
Before starting writing, do one thing is that, Read the topic carefully.
Because if you do not understand what paragraph about it then how will you be able to write a comparative essay. Make assure completely what exactly the topic is. Maybe the topic is broad and short depending on the blog/article and thesis. Whenever you got a thematic topic, that condition you have to brainstorm and thoughtful understanding requires. So when you make for yourself add topic as quotation or quote style but remember your audience will understand easily.