The best way to understand the signs and symbols is with the help of Google Search. For example, there are many images with the signs and symbols you're looking form. You can use Google Search to access them https://goo.gl/O0Hf9s.
There is also a mobile application called IMO. For that, simply start a chat and then press the emoticon icon to see the available smileys and signs. They should be pretty straightforward to understand.