And all end with rhythm practicing again... I wish i have a teacher to teach me about rhythm
Okay, i'm now, will try to find a some easy music sheets, try to count (and to memorize) the rhythm.. Is this kind of practicing effective to improve my rhythm? Or there is another way that more effective?
If you can have a chance to play music with another person such as in a duet, or playing piano along with a recording it will improve your rhythm immensely. As a beginner you really do need to count to understand how the different quarter notes, eighth notes, triplets , all create the rhythm of the music. The way you count has something to do with it too. For example a quarter note counts 1, 2 ,3 ,4 but a 16th note counts like 1 e and a , 2 e and a. I still count sometimes when trying to figure out something but mostly "feel " it but that is because I have played many years of days playing with others in bands or playing along with a recording. It could be that you are just not ready to take on sight reading right now. You do have to know how the rhythm goes. Like I said before, wrong notes are not a big problem but losing the rhythm ruins everything very quickly. All that said I am not a great sight reader, I keep wanting to work things out and practice. To practice sight reading, start with just reading only, dont try to play unless you understand how it all is supposed to fit together. It wont get you anywhere if you cant simply look at it and "see" how it will work. Take your very first entry level music book and see if you can practice sight reading that. Whatever you do, dont feel bad, sight reading is a skill that some do well and some dont. The only reason I ever practice sight reading is because it helps me learn pieces quicker when I PRACTICE them. PRACTICE sight reading, you can get better at it