What does ```{r, eval=F, echo=F} mean?

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1

What is the meaning of ```{r, eval=F, echo=F}?

2

this is rmarkdown syntax. What you show defines the start of a code chunk.

The r means its r language (not pythong or others...)
echo - Display code in output document (default =TRUE)
eval - Run code in chunk (default = TRUE)

Useful cheat sheet is
https://rmarkdown.rstudio.com/lesson-15.html

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3

then what does eval=F, echo=F mean?

4

Eval parameter is whether to evaluate/run your chunk of code
Echo parameter is whether to print the code

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