There are many expressions commonly used in English to express similarity.
There is no magic rule to help you remember them. You just have to learn them. Sorry!
Take a look at the examples below.
To get on like a house on fire.
If two or more people get on like a house on fire, they enjoy spending time with each other and (quickly) become good friends.
E.g. I wasn’t sure if my best friend would like my new boyfriend, but they got on like a house on fire and we are all meeting up again next week.
Like a bolt from the blue.
This phrase is used to describe something that happens totally unexpectedly and without warning.
E.g. News that they wanted to close down one of the factories came like a bolt from the blue. Nobody was expecting it at all. We are still in shock!
Have fun learning English!
Louise