Welcome! It’s not a stupid question, but it is a frequently asked one. There are a number of threads already in the forum discussing the issue of multiple hubs.
As @cobra mentioned, There is no easy or official way to have an action on Hub A trigger an event on Hub B.
There are a couple of complicated ways to do it, which may or may not meet your requirements. These are detailed in the how to article in the community – created wiki on “automating an outbuilding.”
Although that article was intended for people who want to have an event in the main house trigger an event in a shed or detached garage, the same methods would also work for two different houses, particularly the ones which involve two different hubs. So I would suggest taking a look at that article. You are right that there is a possible way through IFTTT, but it can also be done with webcore and virtual proxy switches. neither method is elegant, and both will introduce some lag, so they will work for some use cases and not for others.