Excellent, we can now establish that you have obtained a modicum of elementary reading skills. Now let us move on to capitalization. You seem to understand that you should capitalize the first letter of each sentence, but did you know that you should also capitalize proper nouns? It's true! For example, you should capitalize words like Hong Kong, Dad, and Lake Tahoe. A word of caution however, words like dad can be used as both proper and common nouns. For example, you might say, "I watched my dad warm up the truck at Lake Tahoe during the winter." Notice that we did capitalize Lake Tahoe as it is a name and thus a proper noun. However, the phrase "my dad" is not a proper noun in this context. You could instead say, "Look, Dad warmed up the truck at Lake Tahoe in the winter!" In this case you need to capitalize the word dad. You should practice this rule often, even intermixing the two scenarios. That is, "I already told you, it was my dad! It is not that hard to understand that Dad warmed up the truck at Lake Tahoe. Thus, I can be considered to be an expert on all things involving trucks, winter, and my father in the vicinity of Lake Tahoe."
This last statement provides a nice segue into another topic that you should take the chance to study. Logical thinking skills and abstract thought can be applied to just about any situation that you might encounter throughout the day and it would behoove you to learn the proper forms of their application.