Covid-19 dataset

I’m just a beginner in data science. I’m working on the covid-19 data set and trying to find the dates on which each state recorded the highest number of deaths. the following screenshot is my current dataset after cleaning and I’m blank what to do next.

I’m not sure if anyone will be able to help but at the moment I’m not even sure what this project is. Have a look at the following- How to ask good questions (and get good answers) for some guidance on what to add to a question (in particular a link to the project would be useful :slightly_smiling_face:).