According to Scholling Team's statistics, the Taiwan university system, including 127 Colleges, enrolls international students with more than 1332 majors, from natural sciences to medical social sciences, ...
If you want to apply for college, you usually need to prepare mentally from the end of the 11th grade in high school, because the time to apply for scholarships will start in the fall semester of January to August, depending on the school. If you miss this period, you can apply spring semester but there will be fewer schools and majors.
Most of these university programs are taught in Chinese, but many schools also have English programs. You can refer to the schools in the top 30 of Taiwan. The conditions for applying to this university are different but make sure you have a foreign language certificate to study Chinese in your language. Minimum Toeic is 500, while Taiwan's TOCFL is level 2/3. Some schools still accept HSK, but you need to check again.
Generally, you need to prepare the following carefully: Study Plan, CV, Autobiography, 2 Letters of Recommendation, and proof of financial is usually between $ 5000 - $ 7000. If your GPA is not too high but not too lower than 6.5, you can make an effort to make up for it in Study Plan because many schools evaluate Study Plan even higher than the GPA. You can refer to the application below's scoring method of Aletheia University:
To apply for a student visa, you can see the required documents on this Topic:
Experience for apply Taiwan student visa for Indonesia student
The full details you can also refer to here: Roc-taiwan.org