Assalamualaikum. I know the entire Arabic alphabet, the 4 different shapes of letters. I have begun grammar but it is difficult. Remembering dictionary is also difficult. But I have seen many people that within 2 weeks, they begin reading Quran even though they may be zero in grammar and dictionary. I have tried to read quran but I see nothing but a bunch of letters and I don't have the slightest idea where a word begins and where it ends. Also I don't know when two or more words are united. Can you give me a hint how to distinguish those things when I read quran? Please give me some help.
I completely understand what you are going through as I and all the other people who read the Qur'an have gone through.
I have a couple of suggestions for you.
Go to Quran.com and there you will find each aya (Sentence) separated and if you hover over on the aya individual words would highlight and clicking on them would let you listen to each one. That way you can slowly understand how the words are put together.
Get a Quran English Translation book and look for one that separates every single word. This is how I taught my little brother since those Quran books are much easier to read for those new to the Quran.
By listening you can atart seeing the rules yourself.