u/Dense-Break4573

Hi everyone, am probably gonna expect some flaming but I just got this bike for free on facebook and I am very new into fixing bikes. What I know so far based on my observation is that the chain and cassette needs to be replaced. Which could be the cause of the bike stopping when it is in motion. I was wondering if there are anymore issues for me to look out based on the video? I appreciate the help and am looking forward to bringing back this bike to life :)