Seems confusing, doesn't it?

IMO, a statement is usually something like

if ($this == 1) { do_that($thing) };
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Meaning part of your code that evaluates an expression, or EXPR. In this example, the EXPR is $this == 1, and the if statement evaluates it to return a certain value and perform a function based on the outcome.

It seems to me you are just beginning your journey in the world of Perl, and would do well to invest in a book - perhaps Learning Perl.

Update:

In the simplest possible terms :

Expression

# this is an expression
$foo = 1;
# so is this
$bar = ($foo . $baz);
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Statement

# statements are like :
#if .. else
#while .. do
#for .. 
# etc etc
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Azatoth a.k.a Captain Whiplash