Om Swami
What kind of friends should I choose, and which should I avoid?
Keep company that turns into satsang
Choose people whose company turns into satsang when you sit with them (satsang means being together in spiritual, truth-centred company). Try to avoid company built on criticism and mutual praise. That kind of friendship covers over the faults a person needs to work on.
Such friendship is very harmful, because the faults a person needs to work on get covered by a veil.