To factor $ x^{3}+3x^{2}+2x+6 $ we can use factoring by grouping:
Group $ \color{blue}{ x^{3} }$ with $ \color{blue}{ 3x^{2} }$ and $ \color{red}{ 2x }$ with $ \color{red}{ 6 }$ then factor each group.
$$ \begin{aligned} x^{3}+3x^{2}+2x+6 = ( \color{blue}{ x^{3}+3x^{2} } ) + ( \color{red}{ 2x+6 }) &= \\ &= \color{blue}{ x^{2}( x+3 )} + \color{red}{ 2( x+3 ) } = \\ &= (x^{2}+2)(x+3) \end{aligned} $$