There are the obvious answers.
Donate money to the appropriate causes.
Pass information along to others.
But then there are the less obvious answers.
Be cautious where you send your money.
Be cautious how you deal with it publicly. Some people make jokes to deal with tragedy, and I am sometimes one of them… but not everyone on your Facebook feed is prepared for you to make jokes right now. Tell those jokes to the friends who can handle it. Privately.
But there are even less obvious ways in which you can help.
Make new friends.
Make new friends you don’t want to make.
Draw. Paint. Sculpt.
Find art and celebrate it.
Because honest to God, I believe that truly helps.