Which UTF code should I use?

Which unicode should I use in my HTML document? My doc contains the following codes: Ā which renders Ā ā which renders ā á which renders á í which renders í सरस्वतीनदी which renders सरस्वतीनदी... show more Which unicode should I use in my HTML document? My doc contains the following codes:

&#256 which renders Ā
&#257 which renders ā
&#225 which renders á
&#237 which renders í
&#x0938&#x0930&#x0938&#x094D&#x0935&#x...
which renders सरस्वतीनदी (Sanskrit)
&#3920&#3954&#3906&#3851&#3939&#3962 which renders ཐིག་ལེ (Tibetan)
&#3938&#4019&#3956&#3908 which renders རླུང (Tibetan)

I haven't included the semi-colons because they would render otherwise. I don't know much about unicodes but I intend to learn about them. After realising that UTF-8 cannot be used with these characters, I wondered if others could be used, like UTF-16 or UTF-32 etc. I've also heard of BOM. Does this apply and is there anything else I must include? Thanks.
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