Tech recommendations for Table relations implementation

Hi there.
I’m new to backendless and I would like to know if there’s any tech recommendation as to establish table relations in one or other direction, particularly on the impact over performance of querying. I mean having a one-to-many on parent table, or one-to-one on child table. We’re trying to define a global approach for both composition and association relationships.
If you can help me or just put me on the right path it would be greatly appreciated.
Many thanks in advance,
Paulo