I don't know Indonesian, but here are some general language tips that have helped me.
1. Repeat the same phrases of words until you master it and have it memorized. This helps get used to it.
2. Learning the alphabet of a language should always be the first option. When you know how things are suppose to sound like/or look like, it helps with everything else.
3. I like listening to the same words over and over again, guessing what those sentences mean and seeing if I can understand what the person is saying that selected language.
4. Watching TV shows in that language. It helps me to watch YouTube videos in the language I want to learn because I get more used to hearing it. Reading the caption helps you know what they are saying so you can remember and understand what that words means.
sorry it doesn't make sense much, but it does indeed help me.
