Q1) Can we play it in mobiles? If yes, on which one Android or IOS?
Both android and IOS is not available on Potterworldmc
Q2) Can we play it in tablets? If yes, on Android or IOS?
Nor can you play on tablet.
Q3) Can we play it on PC?
Yes, only via the Java edition, Bedrock will not work.
O4) Which version do we need of minecraft Java edtion?
1.10 - 1.13 I personally use 1.12.2 and have found a great player experience via that version
Q5) Are there any players from India playing this server? (Cuz I am and Indian)
I personally, wouldn't know but I would expect to find some players, as this server is very diverse, with me being Australian, I would say the majority of people on the server are American though.
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Step 1: Open Minecraft Launcher and press Installations.
Step 2: Press New
Step3: Scroll through the versions and find 1.12.2 and press create.
Step 4: Press Play
Step 5: Press Play again.
Step 6: Press Multiplayer
Step 7: Press Add Server
Step 8:
In Server name: Put whatever you wish to have it saved as.
Server address: Add Play.Potterworldmc.com
Server resource packs: Set to Enabled
After that is done click "Done"
Step 9: Press Join Server, if you were to enter the IP correct you will also see the icon for the server and will know you have done my steps correctly.
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I hope this helped, you may simply be unable to connect due to bad wifi or other factors we can not control but I hope to see you on Potterworldmc shortly my friend.
EDIT: I'm not very familiar with the Minecraft windows edition, but after searching up the error I found it is an error received in that edition and, I may be wrong, but I don't believe you get that error in java edition. I believe your still trying to use the wrong edition of the game it must be java edition.