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If you are talking about fetching the custom fields of the Lookup object, you can use the relationship_name.field_name to do so.
For example,
You have ObjectParent__c object and ObjectChild__c is looking up to it (One ObjectParent__c record can have N ObjectChild__c records).
So, from ObjectChild__c you can refer any Parent field using ObjectParent__r.field_name.
Does this help?
If not, can you please elaborate your requirement a little more?