well, ghost can posses you... i think. so as long as you don't get somewhere without any memory, or hear any weird noises, you are most likely fine.

it friendly

i think ;-;

If a ghost is anyway in your house it may not hurt you Because you can understand if it is friendly or not *The light turning of, doors slamming, loud foot steps and worse - Not friendly* And when a person dies , their ghost is re-leaving their past life So that is something as well.

Also, if you want more information Just check this video out - https://www.youtube.com/watch?v=43GiHzda8bg&t=7s

Yeet

The ghost in your house is most likely good