Spacing irregularities in html

I'm trying to format text in html, but there's random spacing that wont go away. I tried fixing padding and margins, but that didn't do anything to help.

I'm new to web dev so I'd appreciate some help and guidance!

Here's my code:

<center> <h2> Hello! </h3>  </center> 
    <h4 style="left: 10px; padding-left: 10px; margin: 0px"> Some thing goes here </h5>
    <h6 style = "right: 90px; padding-left: 10px; padding-bottom: 0px; margin: 0px"> test </h6>
    <h6 style = "padding-left: 20px; padding-top: 0px; padding-right: 20px; font-style: regular;"> description </h6>