Dear sisters and brothers, I hope you can help me by answering a few questions. I hope they have simple answers 
If I take a complete shower/bath, wash my hair etc. do I still have to do wudu before praying?
If the answer to that is yes, can I do my wudu in the shower?
If I take a shower or bath, can I do ghusl instead of wudu even if it's not necessary? It seems to make more sense since everything gets immersed in the water anyway...

If I take a complete shower/bath, wash my hair etc. do I still have to do wudu before praying?
If the answer to that is yes, can I do my wudu in the shower?
If I take a shower or bath, can I do ghusl instead of wudu even if it's not necessary? It seems to make more sense since everything gets immersed in the water anyway...