Present Continuous Grammar Basics = am or is or are + ing form of verb
Examples: They are running.    I am typing.    He is closing the shop.

2a - Primary use: for something happening now. All of the videos in this lesson use the Present Continuous this way.
2b - Other uses: the near future (Example: I'm going to Europe next month), and for long actions in progress (Example: He's studying to become a medical doctor.).

3 - Spelling - Three possibilites: 3.1 - For verbs ending with a vowel and a consonant:
Double the consonant, then add ing - Examples: run - running      jog - jogging      pop - popping


3.2 - Verb ending with an e: Remove e, add ing : close - closing      dance - dancing         smile - smiling


3.3 - For all the others, just add "ing": cross - crossing          read - reading          paint - painting