birds of a feather (flock together)
something that is very difficult to find
boil down to
let the cat out of the bag
the most important thing/the summary/to make a long story short
a very easy task
very easy
where there's smoke, there's fire
cross that bridge when we get to it
solve that problem in the future when it is important
people form groups with people who are similar to them
(looking for) a needle in a haystack
easy as pie
reveal a secret
a bird in the hand (is worth two in the bush)
piece of cake
it is better to hold on to what you have than to risk losing what you have on the chance of something better
there is some truth to rumors