When applying for a job you are more likely to get the job even if the other person Has like more education then you but have no certificates on the other hand you have like 3+ certificates
Jobs nowadays are not given on the basis of education but you are more likely to get a job in a skill im not saying don't study but A Bachelor's degree is enough for most.
You can add a course by going to the learn section at the bottom of your screen, looking at the top and clicking on the downward arrow. Then you can click manage courses, scroll down, and find a course you are interested in.
There are jobs opening up at all levels, and employees with certification are more like to get promoted, especially if they already have more skills than other employees. Getting addition certifications will prepare you for jobs at higher levels before you apply for a promotion.