Tips for checking data integrity / data sanity?
Here are a few things to check in a data set, there could be a lot more but i'm sharing what i did myself.


Check the NULLs in your columns, count them to see if there is a column that contains too many NULLs and that you might want to eliminate
Plot your data distribution each column at a time to see the range of values taken by your data, to see if there is something particularly remarquable about its behavior.
And I'd recommend this famous kernel on Kaggle where a good exploratory data analysis is done.