Make beneficial supplications to Allah instead of cursing oneself or one's possessions.

This hadith is about avoiding self-cursing. The Prophet Muhammad ﷺ warned us against cursing ourselves, our children, or our possessions as it may be accepted at a moment when supplications are accepted. Supplications are prayers that we make to Allah asking for something and invocation is the act of calling upon someone or something for help. If we do this and it is accepted by Allah then whatever we asked for will come true. Therefore, the Prophet Muhammad ﷺ was warning us to avoid doing this because if what we ask for comes true then it could have negative consequences on us and those around us. We should instead focus on making positive supplications to Allah that will bring benefit to ourselves and others in this life and the hereafter.