Can someone explain me about difference between tELTHive components vs tHive components?
At a high level, tELT* components across all technologies build a query for you based on the tELT components used where some of the other components components such as tHiveInput and tHiveRow you specify your own query. Here is some more documentation on tELT:
Introduction to Talend Open Studio for Data Integration.
Practical steps to developing your data integration strategy.
Create systems and workflow to manage clean data ingestion and data transformation.