I'm learning Russian and I have a question how do you tell if a word is masculine, feminine, or neutral?

Ineed asap watch this short video & answer these questions 1. what classifier did she use to show all three of the pigs at one time? 2. how did she show the mama pig and the brother pigs coming towards each other? 3. how do you know that she has transitioned between pigs? 4. what did she describe on the wolf? 5. how did she show the wolf on the move? 6. describe the classifier she used to show blowing 7. what was special about the doorbell? 8. stop the video at 3: 42 what is she showing? 9. what is she describing at 4: 08? 10. what handshake does she use to show the wolf climbing?