Basically, the question is, which level of proficiency you mean. For me, after three years of hard work, it is still only A2 in Japanese, but after one month on italki, it was A2/B1 in Brazilian Portuguese (using "interpolation" from Latin, French, and a little Spanish). IMHO, the best you could get after two months, would perhaps be a A1, and that already would be respectable. For me, Japanese is the most difficult language I have tried to learn, so far. And I have quite a lot of experience. When I talk about "difficult" I mean how much time and effort you have to invest for a certain outcome.

How can I learn Portuguese in 2 months? Please give me your advice. Thank you.

To be honest, I don't think you can... Learning a foreign language takes time and effort, for more than 2 months. Start by getting yourself a textbook, learn hiragana and katakana, and maybe get a tutor. Good luck.

Of course grammar is also important, but if only two months are available I think that you should learn a lot of vocabulary. And you should talk a lot with Japanese people.

@ Skyler Soto "Ok i want to be able to understand and talk and be fluent" Well, my guess is you have to expect this to take years, not months, and you will also have to keep working hard all the time. Sorry, I don't know of any fast and easy approach, let alone a shortcut to Japanese.