SO questions I often come back to:

Why use purrr::map instead of lapply?

What does .SD stand for in data.table in R

Using .I to return row numbers with data.table package

Grouping functions (tapply, by, aggregate) and the *apply family

Reference - What does this regex mean?

What are the differences between community detection algorithms in igraph?

How to add horizontal lines showing means for all groups in ggplot2?

Which layout should I use to get non-overlapping edges in igraph?