Alphabet (non-western languages)
Simple vocabulary
Simple expressions
— with respect to the culture that uses this language. Avoid literal translation, especially concerning non-western languages like Japanese, Korean, Chinese, etc.
More vocabulary
Grammar
Conversation
Consuming content in that language.
Dissecting text-based content to analyse the grammar and the vocabulary (examples, examples, examples).
Changing the computer interface display language to that language.
Engage in online conversations in that language, or at least try to understand the topic of conversation.