This is the 9706th most frequent Swedish word.
generell
General.
Here, "generella" is used as an adjective to describe the noun "opinionen" (the opinion), indicating something that is overall or commonly shared.
Den generella opinionen är att vi bör hjälpa miljön.
The general opinion is that we should help the environment.
In this sentence, "generell" qualifies "förklaring" (explanation), meaning something broad or not detailed.
Han gav en generell förklaring av ämnet.
He gave a general explanation of the topic.
The word "generella" is describing "regler" (rules), implying rules that are not specific to individual cases but apply universally.