word order is not important

In sentences, the case of the words are important to make the sentences to have a meaning.
In a sentence " I love you " , " I " is a subjective case and " you " is an objective case.
If " You love me", "You" is a subjective case and "me" an objective case.
You may understand , in English, the word order determines a case of each word.

Let us say " I love you " in Japanese.

Watashi wa anata o aishiteimasu.
watashi = I, my, me
watashi + wa = I
anata = you, your
anata+o = you(object)
aishiteimasu= love

You may understand that a particle word( eg. wa, o, ga and etc.) makes the word have a case ,not a word order.
Let us see a sentense with replacing "watashi wa " with " anata o".

Anata o watashi wa aishiteimasu.
This sentense also means "I love you ".

Japanese people may not misunderstand what you mean as long as the word has a particle.

Major particles to make the word subjective are " wa" and "ga".
Major particles to make the word objective are " o".

Watashi wa hon o yomimasu. ( I, book, read) = I read a book.
Hon o yomimasu watashi wa. ( book, read, I)=I read a book.
Yomimasu hon o watashi wa.(read, book, I)= I read a book.