2
There are nested clauses, and that's why there are two が's. To break down:
新しいコロナウイルスは人にうつる。
The novel coronavirus infects people.
(Note that うつる is an intransitive verb in Japanese)
新しいコロナウイルスがうつる人
people which the novel coronavirus infects
(Simple relative clause)
→ people infected by the novel coronavirus
新しいコロナウイルスがうつる人(の数)がどのように変わるか
how the (number ...
2
I would parse it as:
[どんなことでも][失敗したら、人のせいにしてはなりません]。
[No matter what it is,] [if you fail, don't blame others].
The [人]{ひと} here means [他人]{たにん/ひと}, "others".
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