Among the features of Codeforces, one of which I don't understand is the rank table. But I'm not getting any suitable source to learn about those stuffs. Today I'm here to the community with my query. Notice the segment of the standings given below:

Click here...

Question 1: What is meant by the section penalty? I'm also curious to know how this number is calculated.

Question 2: What is meant by the + sign and the number written just below ( colored green) ?

Thanks for having patience to read this blog. I'll really appreciate your help.