The preliminaries of any kind of skill is the most important, these initial skills re called the basics. The form the foundation of what will be taught in the proceeding stages of that particular skill. In Aikido there are some basic skills that every Aikido student should have. These skills are as follows.
To start with you have to understand that just like there is an attacker and a defender in all games, Aikido has basic techniques depending on the position of the Aikido student. The defender who in most cases is encouraged to be the aikido student is called Tori while the attacker is called Uke.
Some attacks are not included in the basics of aikido because they are considered difficult or awkward to the attacker. Any aikido schools are aimed at making the student fall in love with the art and appreciate the techniques. It would therefore no reasonable to include difficult techniques in the basics. Doing so would only make the student to associate the art with difficulty and this would put him under pressure.
Performance of techniques should be reasonable. There are some techniques that might grasp let alone performing them but all in all they are still basic. The reason is that some techniques are only basic to some attacks and not others. A student should not expect to learn only simple techniques, because there are techniques that cannot be simplified or taught in any simpler way that they are already. Therefore some reasonableness is needed.
The basics of aikido should be compatible with other systems of martial arts. The training of Aikido is such that they student is able to learn, adapt and use the basics that he has acquired in another dojo. In other words, there should be some connection is different Aikido dojo.