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I read some other questions but I'm still having trouble.

I' ve got Custom object A and B. A has got a LookUp relationship field on B named LookUpB__c.

I'd like to get the value of Name of B. This is the query I'm using:

SELECT Name FROM B WHERE id =: A.LookUpB__c

What am I doing wrong?

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    So are you looking for a particular record or just all the names of B? The way your query is set up right now (when fixed) will just grab all the names of B – Griffin Jul 22 '16 at 16:00
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// Assuming you are querying object A , need to use (__r) to retrieve Parent fields.

__r is for Custom objects reference For example: Custom_Object__r . It is used for reference custom object relationship name in Apex or visualforce page, formula field etc. Used as suffix.

String strBName = [SELECT Id, LookUpB__c, LookUpB__r.Name FROM A WHERE Id=: 'Id of Record A' limit 1].LookUpB__r.Name;
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If you're looking to just grab the Name of Object B when given Object A you should try this:

SELECT Id, LookUpB__c.Name FROM A WHERE Id= [Id of Object A]

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