Japanese grammar

The grammar for Japanese is really hard for me. Vocab isn't a problem, I got a large vocab, and anything I don't know I can just look up. I learn kanji really quick, again, not a problem.

However, grammar is where I struggle. It's such a bitch, like wa and ga. I know what they are, wa = topic, ga = subject, but when I think about it, I don't even know what the difference is between subject or topic, all I know is what sounds right, so when it comes to forming my own sentences, I suck. Is there a website that focuses mainly on the grammar? I'm not looking for really newbish stuff, I got 1 year of Japanese schooling so I know the basics. Also, wa and ga are definitely not my only grammar problem, I was just stating one example.

www.guidetojapanese.org

You'll have to pick up some of them by reading and observing how Japanese use them. No way you can expect to learn all of them from grammar books. Grammar is a "language sense", you'll have to pick up half of them by deduction. The more you listen(important), deduce and observe the better you get.

in before "Go to Japan and get a girlfriend", my automated response to that: "Fuck off."

Go to Japan and get a girlfriend

>>1
Go to Japan and get a boyfriend

Go to Japan, get a cheap apartment, lock yourself up and masturbate for ever.

it is easy as hell.

Go to Japan Go to Japan Go to Japan Go to Japan Go to Japan Go to Japan Go to Japan Go to Japan Go to Japan Go to Japan Go to Japan Go to Japan Go to Japan Go to Japan Go to Japan Go to Japan Go to Japan Go to Japan Go to Japan Go to Japan Go to Japan Go to Japan
And get a girlfriend.

Get a girlfriend first. Then don't go to Japan.
Or just kill yourself.

in after "Go to Japan and get a girlfriend", my automated response to that: "Fuck You"

>>1
ok, for example:
I like her.
私は彼女が好き。
the main point of the sentence is the girl, you could actually say:
彼女が好き。
and that is perfectly fine
はis only used for the times when you can leave it out of the sentence and still have it make sense. はis used for the subject that is most of the time never said because it is already known.