How can I make immigration to Germany ?

Please kindly note that there is no specific immigration program for Germany, such as the Green Card, the American Lottery, or immigration to Canada, knowing that immigrating to Germany requires obtaining an entry visa for any purpose, and you can generally be informed about immigration to Germany, see the following:
Germany Immigration to employers

Germany reported a shortage of highly qualified and skilled workers e.g. engineers, IT professionals, medical professionals, and other qualified professionals. To encourage such people to immigrate to Germany, foreign immigration authorities have reduced the strict requirements for residing in Germany and work.
Due to that, one of the most sought immigrants to Germany is to find jobs in the country. Here are the steps to move to Germany for work:

Finding a job in German companies / entities which accept foreign nationals
Apply for a work (Germany) visa
Moving to Germany and obtaining a work residence permit
In addition, to obtain a residence permit to work in Germany, the employer and employee have to demonstrate the following:
That, there was a shortage of personnel from Germany or the European Union, so the position could not be filled by them
The employee must have the same conditions as any other German employee in terms of salary and work field
The employee shall meet all educational and practical experience required for the job
The company recruiting the employee shall meet all the requirements of the German country (registration and certificates)

As an employee in Germany you will get an opportunity to work as long as the residence permit is valid. If your employer wishes to continue your work contract even after your work permit expires, you can apply for an extension, you can also apply for permanent residence as well.
If you are an unskilled worker, however, it will be more difficult to migrate to Germany for work.
Germany immigration for education
Many people are not aware of these information, but Germany offers free of charges education. This means that unlike countries like the United States, which has huge tuition fees, universities in Germany either have very low fees or do not charge any amounts at all. Therefore, Germany is a popular country to migrate for educational purposes.

In order to immigrate to Germany to complete a university degree, a visa must be obtained for study purposes in Germany. The article explains the requirements that need to be met and the process for applying for such a visa.
If you get the study visa for Germany and complete your degree, you can reside in Germany to search for a job for a limited period. If you can find a job during that time, you will be allowed to stay in Germany. It is reported that up to 54% of students who complete a degree in Germany remain in the country and find a job.
Germany immigration for business
If you are an investor with an interest in Germany, you are in luck. Businessmen and investors who create economic opportunities in Germany are allowed to immigrate there. However, there is a certain threshold on investment that needs to be made. As of writing this, the  amounts are around 250,000 euros. In addition to that, you will need to obtain a self-employment visa that comes under the Germany work visa category. To obtain a visa, the following must be proved:

To have the sufficient money to make the investment
Your investment must benefit the German economy
Your investment is demanded in the country
If you maintain your position as an entrepreneur in Germany, you will also be allowed an unlimited extension of your residence permit after three years, which means that you can enter and exit the country whenever you wish.
Germany immigration family reunion
There are cases when people move to Germany for various reasons, but they have to leave their families in their countries of origin. All spouses and children under the age of 16 are allowed to apply for immigration to Germany to join the spouse or parents.
In order for the spouses to be eligible for family reunion, they must prove that they are married and that children must present birth certificates. For children under 16, they do not have to have German language skills since they are supposed to be able to learn this quickly. However, for children over 16 years old, there must be a sufficient evidence on German language proficiency, adaptability, and inclusion.

In order for the spouses to be eligible for family reunion, they must prove that they are married and birth certificates for children shall be submitted. For children under 16, they do not have to have German language skills since they are supposed to be able to learn this quickly. However, for children over 16 years old, there must be sufficient evidence of German language proficiency, adaptability, and inclusion.
As for couples, they will need to be at least German A1 qualified to qualify. And if the husband already in Germany is allowed to work, the same applies to the other spouse who joins him. Thus, the spouses' visas are bound by the same conditions.

German residence permits
When you get one of the immigration visas, you will also get a residence permit. Residence permits can be temporary and permanent types. Temporary residence permits allow foreigners to reside in Germany for a specific period of time and then return to their countries. Permanent residence permits states that a foreigner can reside in Germany as long as they wish, and they can leave and return to the country whenever they wish as well. However, a permanent residence permit does not indicate that you acquire a German citizenship. This is a totally another process. In general, there are temporary and permanent residence permits in Germany.

Standard residence permit
This type of residence permit is used for all immigration purposes referred to the above, as well as for other purposes such as attending training courses for former Germans who wish to return to Germany, and those who go to Germany for political and humanitarian aims. Regular residence permits are valid for some time and can be extended.

European Union (U) blue card
The European Union blue card is given to foreign workers (who are not citizens of European Union countries) who have high qualifications and want to work in Germany and apply these skills. Higher qualifications mean that a person has a Bachelor's or Postgraduate degree in any particular field. To qualify for the EU blue card, you will have to be already found a job in Germany, and the minimum annual salary must be 50,800 euros.
The blue card gives the holder the right to reside in Germany for a period of four years, with the possibility of changing their residence permit to a permanent settlement residence. To qualify for a permanent settlement visa, a person has to demonstrate sufficient German competence, meet some financial requirements, and must have worked in Germany for more than 33 months in their place of work which requires the acquired skills with the highest qualifications.
Residence permit or permanent residence permit
A permanent residence permit in Germany is named a settlement permit. This is given to those who have either a standard residence permit or a European Union blue card for a minimum of 5 years and already meet specific language requirements.