How to fix a non rotating motor stuck drum for Samsung Ecobubble or faulty heater

Step by step options to try and resolve a stuck non rotating motor and drum caused by 1) item of clothing getting between drum and housing 2) the belt breaking or coming lose between drum and motor.
Also shows how to remove and replace the heater, if having issues with this.
If it is the belt - the item is here: amzn.to/3yfQsXA
All the way through, if not comfortable please call an expert engineer. If do proceed, ensure plug removed so no power.