If you are in ROTC the first 2 years (MS I and MS II), you do NOT go to Basic Training. The first 2 years take the place of that training. The courses will cover very basic military items -- rank, first aid, map reading, military customs and courtesies, military structure, etc. This is similar to what is covered in Basic to transition recruits from civilian to military life.
The third year (MS III) is when things get serious. You MUST be "contracted" (agree to serve in the military) in order to take the MS III course. This is when the training moves to how to be a junior officer. You will learn about small units, leadership, different branches, marching, leading groups of Soldiers, etc. The emphasis will be to prepare you for the leadership course you will attend between your junior and senior (MS III and MS IV) years. This courses is called LDAC - Leadership Development and Assessment Course. It is a 29-day course at FT Knox, KY. You may also attend Airborne School or other training during this summer. There will also be more of an emphasis on physical conditioning and you will take military physical fitness tests regularly.
The fourth year (MS IV) focuses on the preparation for a commission and starting your career as an officer. You will get more leadership, learn about the branches and career tracks. You will submit your preferences for a branch. During the 2nd semester, you WILL be assigned to a branch. At graduation (or the end of the MS IV course) you will be commissioned as an officer. You will receiver orders to attend BOLC - Basic Officer Leadership Course for the branch you receive. This is your specific job training as an officer. It is a "gentleman's" course. That means you have evenings and weekends off. You can have a car and are pretty much on your own if you are not in class or in the field. You will be paid full pay as a 2LT. Depending on your branch and assignment, you may receive additional training (Airborne, Ranger, etc.) You will complete the training BEFORE going to your first unit. During BOLC, you will receive orders to your first unit.
The difficulty of Basic Training is irrelevant. It is only 8 weeks and it is EASY. For officers, BOLC is more intense than the comparable AIT (job training) for enlisted. It is longer and you will be getting more of an emphasis on leadership than the enlisted Soldiers, but you will still be exposed to the basic Soldier tasks for your branch. You won't be micro-managed with additional duties and restrictions like the enlisted in AIT.
When you get to your first unit, you will be challenged. (What is the difference between a PFC and a 2LT? A PFC has been promoted twice. What is the second most dangerous thing in the Army? A 2LT with a map. What is the most dangerous? A 2LT with a map and a compass.) If you spend your time listening to the "more experienced" Specialists in the E-4 mafia you will be a waste. Your most important relationship will be with your Platoon Sergeant and how well you work together. A good PSG will be training the new Lieutenant. A good Lieutenant will LISTEN to his Platoon Sergeant and request advice, but you will still be the one making the final decision, no matter how much experience he has.
When you get to your first unit, you will be participating in all unit training. You will be expected to be technically proficient to check on Soldiers and know enough about each job that you don't look like an idiot. You SHOULD take the time to learn from the NCOs to give them a chance to teach you and show your interest. You will have to be just as physically fit as every Soldier in your unit. You and your PSG will be the first to show up in the morning. You will usually be the last to leave. After you finish your "training", the Soldiers will go to the bar to trash talk the new Lieutenant and how easy he has it. Meanwhile, you will be doing paperwork and providing reports to your commander, so you are able to participate in the unit training. Every time ONE of your Soldiers makes a mistake (DUI, fails a physical fitness test, loses equipment, etc) YOU will have additional work.
You will have PLENTY of opportunities to demonstrate your capability to the Soldiers in your unit. Attending Basic Training is NOT one of them that matters.