If you have nothing to do, you can visit Taobao's men's clothing store and see how the owner matches the clothes. Of course, you can also look at street shooting or fashion magazines and look for inspiration from those hipsters. Over time, you will feel it. Then according to your figure and skin color. Appearance, financial ability, choosing the right clothes to match or what kind of pose to put.
Website, Taobao Mall and men's section on Taobao are all good. Or street shooting network is also ok.