how i apply work permit

Although your query is not clear, about the country in which you want to obtain a work permit, here is the following information:
In general, the way to get a job differs from one country to another, as follows:
First: Countries that organize a program to receive immigrants for the purpose of work:
Immigration to these countries depends on submitting an application to the Immigration Authority through its website, and this application is followed by evaluation through several factors, and for each factor
Specific degrees, and the applicant must obtain a certain number of degrees, in order for his application to be worthy of acceptance.
These factors range from the academic qualification factor, the age factor, the experience factor, the factor of mastering a foreign language and some other factors.
After obtaining the specified number of scores for all the elements of the assessment, you will be eligible for an immigrant visa.
Examples of these countries are Canada and Australia.
After approval of the immigration application, in that case, you can work and obtain a work permit.
Second: Countries that do not have an organized program to receive immigrants for the purpose of work:
In those countries, a work contract must be obtained in order to obtain a work visa and work permit, and a work contract can be obtained by obtaining a tourist visa.
Searching for a job during the visa validity period.
To leave the country before the visa expires, provided that the employer sends the work contract to the place of residence, so that it can return to that country again under a work visa
It is obtained through the embassy of that country after submitting the work contract to it.
And that method is the closest realistic way to obtaining a work contract in a foreign country, for example, Sweden, the Netherlands, Italy, Germany and France.