best way?

Show your love in the silent way.It is the best way to show your love.Like you know what color she/he likes,so one day you wear that colored shirt,so,she/he will understand what are you trying to say.Or do something like this.Showing love in the silent way is the best way to show your love to someone, in my opinion.

Don't make she or he feel awkward is the most important I think.
you can tell she or he directly or hinted to her or him.

simply dare and tell her, though i never dare to tell in my whole life and for that i always on a loss

The Best Way To Express your for Love Someone Is To Express your Love with Poetry
Show someone how much you love them with magical words of poetry:

The Moment I Met You
My life changed when I first met you,
Our first kiss was short and sweet,
I will love you always to all ends of the earth,
My love for you grows each day,
Your soft luscious lips,
The way your skin smells,
Everyday I see more reasons why I fell in love with you,
Just the two of us,
from when the sun rises till the sunsets I am breathing you.

Eternal Love: Romantic Poetry Straight from the Heart