Statistical question:

1) Why the average days to find a block in the past 6 months is 30 days while it used to be 5 days?

https://imgur.com/a/SxvSn

Technical questions:

2) I connected to someone's node (because I do not know how to create one) that has an average ping time of 75 ms, is this good?

3) Is there video tutorial for beginner like me showing how to create a local node?

For example I do not know how to "run bitcoin with the RPC interface enabled" and how to"Run a miner daemon"

thanks