Write a paper on the available certifications that companies provide and which are most popular.

Write a paper on the available certifications that companies provide and which are most popular.
Which roles and job titles could use project manage certifications and which uses it the most.
Salaries differences in regards to certification.
Other project management certifications such as scrum master, agile certs product owner.
For ppl who want to know if the certifications are worth it
Which cert is best for beginners
How hard are the exams; is an mba better than the certifications; costs/who qualifies/whos it good for (details about certifications); how long is certifications valid for;
provide as much details as you can for each certification