The TE-form in Japanese is very useful, not only to make requests (for e.g. 〜てください) but also to link sentences and change tenses of verbs. Once you master it, you can easily replace the て with た to get the past tense form called the 〜た form.
While there are several songs around the Internet and in textbooks, I’m sharing the one that has helped me learn it, and till this date I hum it when in doubt. The song is courtesy of my dear friend Soham.
では、