If you want to use italics, be especially careful of italics with serif fonts, as many letters become harder to read when angled . This is Zapf Humanist in italics . As you can see, it is less fussy. In this context, justification means lining up the edges of your work. Left justification lines up on the left but has a ragged right edge.
Full justification lines up on both right and left edges.
This paragraph is left justified. I use a left justification for plain language. With full justification, the spaces between letters and words are stretched or squeezed, which makes reading harder. Upper and lower case. Use upper case letters judiciously.