Meaning of hěn:
hěn
很
Adverb
very; quite; (also, often used before an adjective without intensifying its meaning, i.e. as a meaningless syntactic element)
Jīntiān de tiānqì hěn hǎo.
今天的天气很好。
Today's weather is very good.
Jīntiān tiānqì hěn hǎo.
今天天气很好。
The weather is nice today.