Full Bridge Inverter vs Half Bridge: Usage, Output Harmonics, and Even Harmonics Explained

1 _ why full bridge inverter is more commonly used comare the helf bridage inverter?
2 _ why there are harmonics component available in the output of inverter ?
3 _ why there is no even harmonic component in the output of inverter ?

please send to me in my email because i do not know how the use your page ... thanks