Yes. In the Olympics, one can compete in many events. The issue is with the scheduling. At the same time, several events take happen at various locations around a country. So to prepare for all of them, athletes have to start training early in their career.
An athlete can enter up to three events per sport. If an athlete places first in each event, they win a gold medal. If they place second or third, they also win a silver or bronze medal respectively. If an athlete fails to win a medal in an event, they can still contribute to their country's result by competing in the next event.
In modern sports, some events are limited to specific types of athletes. For example, only those who have trained for years and played at the highest level are allowed to compete in professional tennis tournaments. Other events are open to all kinds of athletes: marathon running, cycling, swimming, etc. In these cases, the number of available slots is limited only by the human body. An athlete can decide which events to enter based on their own preferences and what countries are participating in the Olympics that year.
In general, more competitive events mean better chances of winning medals.
As a result, it is almost impossible for a human to be in two places at the same moment. The maximum number of entries that any single athlete can receive into an event is two, since this is the limit of how many countries can participate in each sport.
In practice, most athletes who qualify more than once in an event do not win again. Those who do win again tend to do so quite quickly after their first victory. Most athletes drop out of the Olympics when they cannot find a way to pay for the cost of competing.
The only exception is long-distance runners who are allowed multiple entries because it takes them so long to complete an event. A high-profile runner such as Haile Gebrselassie has been known to try out for as many as five events within a single Olympic year (August 2-14). His previous three attempts were unsuccessful but he did manage to break the world record twice during his career.
It is possible for an athlete to enter four events in one day at the Olympics. Such athletes are called "quadruple jumpers" because they attempt and successfully complete the highest jumping event on the program (the quadrennial quadrupole).
With over 200 nations competing, the Olympic Games are regarded as the world's premier sporting event. The Olympic Games are generally held every four years, with the Summer and Winter Olympics alternated every two years. The first modern Olympic Games were held in Athens, Greece, in 1896.
All sports except wrestling are played at the Olympics. In addition to the traditional ball games (football, rugby, basketball), other sports featured at various times include acrobatics, athletics, boxing, canoeing, equestrianism, fencing, gymnastics, ice hockey, judo, rowing, sailing, swimming, tennis, volleyball, and wrestling.
The largest nation at the Olympics is China, which has taken part in every summer Olympics since 1952. Russia, United States, and Germany are also among the most successful countries. Some countries that have never won a gold medal are Argentina, Australia, Belgium, Colombia, Costa Rica, Cuba, Ecuador, France, Guatemala, India, Indonesia, Ireland, Israel, Japan, Mexico, Morocco, New Zealand, Nigeria, Norway, Pakistan, Panama, Peru, Philippines, Romania, South Africa, Sweden, Switzerland, Trinidad and Tobago, Turkey, Ukraine, and Venezuela.
Each country selects its own athletes, but they must be approved by their national sport organizations before participating.
Each contestant is limited to competing in one individual/team event and one chapter event. For prize eligibility, each contestant must compete in all aspects of an event. If a contestant is unable to complete an event, they may submit a substitute performance or leave the competition entirely.
The number of events you can do depends on how much time you have to practice. If you have only a few hours a week, then you should focus on learning as many events as possible so you don't miss out on any opportunities.
It's also important to note that there are restrictions on what type of events you can do. For example, you can't be part of a team for a balance beam event and also need to take care not to compete with yourself (i.e., no self-contests). The same rules apply when selecting your division: for example, you can't choose artistic gymnastics while another athlete is selected in your place. These rules are often communicated by national organizations to help ensure that everyone has an equal chance of winning prizes.
In conclusion, the more events you know, the better your score will be. This will give you a better opportunity of winning prizes and advancing in the world championship.