Register all variants of any domain name you may have a use for.
I recently had a visitor to my office who has a very exciting product to launch. I asked him what his URI was, he said the address, it ended with com as in telecom, so I typed it in with one M, as you might. Ah , horror of horrors it was not his, the URI he had registered and was using, ended with two Ms. Needless to say, before our meeting was over we checked all variants of his domain and spent money with the registrar accordingly.
My advice only, you don’t have to take it.