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Hi Shoukri! Thank you :) 
As for the question about data structures and algorithms, I did a number of things. First, I would read up on the details to get a sense of the information (I used interactivepython). I would then practice these concepts with coding challenges. In addition, I watched MIT Open Courseware videos on algorithms and Big O. Finally, I reached out to upper-year students as well as industry professionals for more help when I was getting stuck on more advanced topics.

Hope that answers your question!