Great execution towards a terrible idea will get you nowhere.
Before product/market fit, your only job that matters is to build a great product.
We hear again and again from founders, that they wish they had waited to start a startup until they came up with an idea they really loved.
Or a way to stay on strangers couches, that just sounds terrible all around.
Be suspicious of any work that is not building product or getting customers.
Investors will sort of like write the check and then, despite a lot of promises, don't usually do that much; sometimes they do.