1st Encounter: When Hobglobin throws bombs at you, just press to catch them with your web, and :again to throw it back. Locking on helps. When he takes out two bombs, he should be above the solid ground. Press to shoot webs and make him drop them. This will damage him heavily. When he is on the ground, use strong attacks against him.
2nd Encounter: For this fight you just need to throw the bombs back at him while avoiding/fighting off the various enemies attacking you.
3rd Encounter: Again, you will just be throwing his bombs back at him. There are a decent amount of enemies that fight you at once, so just jump in the air and try to throw the bombs back as best you can. Defeating enemies here is not a requirement to continue on.
Final Encounter: When the red creatures appear, defeat them quickly. Hobgoblin regenerates health during this time. Shooting web at him to make him drop the bombs will no longer help you. You will have to either jump or slow down time and just throw one of the bombs back instead. Sometimes during this fight he will land and a surge of energy will radiate from him. Jump and press to web kick him at this point. Now you will be able to continue attacking.