In Japanese, there are many particles, like は が を に and many more...
What each particle means and how to use it is a large part of learning Japanese grammar.
When I search online I find a good website...
The Particles covered in the website are all written in roman characters, so I will write in hiragana for you (particles is always hiragana)
は wa (you write "ha" in hiragana for the wa particle only)
を o (you write "wo" from the "wa wo" line in hiragana, but most people when roman character it, write "o")
へ e (you write "he" for the e particle)