First off, welcome to the forum! It's always nice to get members from other countries to offer different perspectives
In regards to your question: I realize English isn't your first language, but can you try and be a little more specific on what information you're looking for? I'll try and give a brief overview to try and hit the main points.
EMT in the US is typically the entry level to our EMS. It's only a 120hr course (usually one college semester), and usually requires no prerequisites. It is not very science-based. It focuses more on recognizing immediate life threats and providing basic life support until they can get them to the hospital. Typical training includes:
-CPR/AED
-Oxygen administration
-Splinting
-Spinal immobilization
-Recognition and treatment of shock
-Medication administration such as NTG/GTN, Aspirin, Epi-Pens, oral glucose, and Albuterol (the ability to give medications varies widely depending in the region).
There's not a lot of focus on specific medical emergencies. The main ones taught are myocardial infarctions, strokes, diabetic emergencies, seizures, asthma/copd, anaphylaxis, shock, and cardiac arrest.
Again, just a quick, broad overview. If you have more specific questions, we'll be more than happy to answer