There is nothing wrong being curious about subtle realities like bhoots. Bhoots exist. They should be avoided because they do not belong mixing with the living. They drain vital energy and can create conditions of disease in mind and body. But understanding about bhoots and pretas is not a bad thing, just depends where you get your learning from. For best understanding of reality, read Gurbani. It's better to have an interest in Waheguruji because reality of the God is so much greater then the suffering reality of a bhoot. But without our Guruji, our whole life is only suffering and we would surely become a haunting bhoot here. Because we have Guruji, we can obtain mukti! This is something all the suffering beings need, so just do Ardas for all who are lost and suffer and be a good Sikh. Guruji will bless you for doing seva of paat for those who suffer. And always be kind. Bhoot is in darkness, and darkness hides itself from jyot. So if you are filled with jyot from Naam bhoot has to flee and cannot scare you. Just bless the suffering spirits and radiate the light of peace. Guruji can free a soul from hell realms, so sometimes a bhoot wants mukti. Just do lots of paat and spiritually cleanse yourself and your environment to avoid bad influences from lost or evil beings.