Can I use wifi sharing or use wifi and hotspot both at the same time in my samsung galaxy A05s?#Wifisharing

I want to buy charging adapter for my new A05s.Can anyone how much watt charger should I buy?And where I can buy original samsung charger.

I bought this from one of mobile markets and it was used already. I have took my phone to Samsung customer service, they tried to install a new software but they said we can not do it as another software is installed in it which they don't know how t...

Can anyone tell me how to fix this?