If you have self-discipline, study by yourself and arrange your own time. Don't learn too much and don't learn too little. If you learn more, you won't remember. If not, it will not be consolidated. You can learn everything in the internet age. Now, there are many office softwares. Organizations generally use OA system, which can basically operate. EXCEL is the foundation. Anyway, you have to know the basics of office. But then again, clerks are low-level jobs that people with academic qualifications don't like to do, and people without academic qualifications don't have to. Leaders generally don't take long, because they basically know the actions of leaders, and leaders like inexperienced ones, hehe.