Android

android studio

https://www.youtube.com/watch?v=B1rlT5KQ0yE&index=1&list=PLOU2XLYxmsIKkg55tSHz0Xc8ZMVS1GJQL

android studio + firebase

https://www.youtube.com/watch?v=7E13ZBCyKT0

android studio

https://www.youtube.com/watch?v=k0fNMXAfqFc&list=PLxNM4ef1BpxioEfpRq0c0PM9408RpqaIY

https://www.youtube.com/watch?v=PBvoq0LzP8Q&list=PLInBAd9OZCzz5yjVdvXuteBJYrsZiU_ot&index=4

https://www.youtube.com/watch?v=MnJEbS5p3kQ&list=UUIMMpAKHWdp8Vf2vMuuLX8Q&index=23