Dead Comment
I’m not a native speaker, but I always heard that the Greek derived Rosyjski/Rosjanin/Rosjanka were for Russians (ie the ethnic majority in the Russian Federation) but Ruskie was still reserved for the Rus’ in general.
I’ve had native speaking members explain the distinction to me, that ruskie is more of a catch-all term for the Rus’ peoples. Then again, my family hails from northeast and southeast Poland near the borders with the Rus’.
Pierogi Ruskie is my #1 food when going back. That cheese filling with onion + a good dollop of sour cream. They are the best pierogi for me.
The CSI course itself isn't a FAANG prep nor will you take interviewing or leetcode classes.
Here's a free version (and larger in volume of knowledge) of what CSI offers to enable you to understand and interact with: teachyourselfcs.com/