Need Help Coding ANOVA in R

I'm new to r and I have read numerous pages on creating one-way ANOVA in rstudio but I can't seem to get my data to work properly (I keep getting "null" when trying to show the levels). Could someone please help me walk through the process of creating a one-way ANOVA? I'll provide the link I was using and a screenshot of what my data looks like. Thank you so much.

Hello, is this related to your question regarding showing the levels?
I appreciate you're enthusiasm, but best to pace yourself and get the basics first; see you on that other thread?

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