Hi, i'm new and want to contribute
Every edit will have your username on it. If you edit a lot in certain areas, one might guess that you live/work around there. Other than that, I doubt there are any such considerations.
Some apps allow uploading photos when making a note. These services may not clear some of the metadata, though geolocation is already obvious from the note itself.
Thank you. I would be changing my username regularly and posting at random times.
@Cheradenine @Tyoda @openstreetmap
I don't think that changes your underlying account ID.
Whatever you do you need to make sure that you are contactable through the email address(es) you supply. If there is a problem with some of your edits and you don't reply to queries you may have your account(s) blocked and all your edits reverted.