Google ads character limit are very much helpful as before this year the character limit for this was 25-35-35. As if you want to see it more deeply you can understand it by this as 25 words can be used for the prominent headline 35 can be for the description with a relevant URL otherwise they will disapprove of your ads.
But from this year the scenario has changed it is 30-80-30, it means they had upgraded this by 45 characters. The rules are 30 characters that can be used in the prominent headline and know 80 characters can be used in the description with a relevant URL.