To know Arabic you need to master reading and writing the letters.
To know Tajweed you need to know how to pronounce the letters from the right exit and with the Harakat vowels.
In the below lessons, you will end up mastering both insha'Allah. Listen, write, and pronounce as you hear:
http://alsunna.org/Letter-Practices-for-Tajweed-tmaaryn-Hrwaf-aaltjwayd.html
Arabic Vocabs: (http://alsunna.org/gallery/data/media/20/alphabet_picture_chart.jpg)
Get your tajweed improved, follow these lessons.