There are several basic Aikido Attacks that are used in dojo's around the world. Here is a list of the most common attacks...
Shomen Uchi - open strike to the forehead.
Yokomen Uchi - open strike to the side of the neck.
Shomen Tsuki - punch to the solar plexus.
Katate Mune Mochi - single hand chest grab attack.
Ryote Mune Mochi - both hands chest grab attack.
Katate Mochi - single hand wrist grab attack.
Ryote Mochi - both hands wrist grab attack
Hiji Mochi - elbow grab attack.
Ryote Hiji Mochi - both elbows grab attack
Kata Mochi - shoulder grab attack.
Ryote Kata Mochi - both shoulders grab attack.
Eri Mochi - neck grab attack.
Ushiro - these are attacks from the rear.
Hanmi Hantachi - attacker standing, defender kneeling.
Suwari-Waza - both kneeling.
These are some of the most common Aikido attacks used in dojo training, but there are several more that may be used. For example, front thrust kick to the groin or stomach, Round hook kick to the lower leg, thigh, torso, or even head, head-butt to the face, etc.
Well, this really depends on the particular style of Aikido that
you are practising, and also on what you are trying to achieve from it.
If you are new and aiming to learn attacks and techniques, then it is best to keep the power levels down low. This removes some of the fear involved, and allows you to work on the movements and repetitions, that will develop and deliver the info in your body/mind.
Once you are past beginner stage, and have a knowledge of Aikido attacks and techniques, then the power levels should be raised. This helps you to learn how to perform a good technique, whilst your posture and ability to move smoothly are slightly tested.
After you have a good knowledge, then it is time to attack even harder. This raises the fear level, and encourages you to get it right first time. At this level you will also know if you are performing correctly, as your technique will flow smoothly, or not!
The final level of attacks and defence, that many dojo's do not practise, is to...
truly pressure test the techniques.
This is where full power strike and grab
Aikido attacks are used. You will learn, very fast, whether your block
is correct or not, if it isn't you will get hit.
Training at this advanced and resistant level will help bring the martial spirit back into the art. It also raises your fear level, closer to what you may feel in a street encounter.
Of course, the violence
of a street fight is a whole new experience, that I hope you don't have
to go through, but, it is essential to train for the possibility...
It is good to, occasionally, practise attacks and techniques,
as if it is for real. The closer you get to practising defence from very
powerful attacks, the more confident you will be.
If you fail to practise hard, then you will not have the tools required when that surge of adrenaline runs through you. You see, in the street there are no rules, and your attacker will not be compliant and fall down easily.
So I suggest that you train aikido attacks hard - But Smart!