Foe those that don’t know. Wherever you create an account, all the information stays on that particular instance. E.G. Lemmyworld lemmy.ml.

To reduce the load on a instance, users should create accounts on other instances that is geographically close to you and have plenty of server resources. This would lead to a smoother and faster user experience.

You will still be able to comment and interact with users and post on lemmy.world or lemmy.ml even if you created your account elsewhere. (Unless the instance your account is created on gets defederated).