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Is the Bitcoin wallet address is case sensitive or the upper case or lower case does not matter ?
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It's case-sensitive. Luckily, the address contains a checksum, so the wallet will tell you the address is invalid when you make a mistake. And to avoid confusion, the characters 0,O, I and l are not used.

On the other hand, Ethereum addresses didn't contain a checksum from the start and were case-insensitive. This has led to some expensive mistakes. Today, you can convert a case-insensitive ETH address to a case-sensitive address with a checksum, which otherwise consists of the same letters.

Anyway, I'd recommend copying the address or scanning a QR code on your phone. Do check that you copied the address correctly. There is malware that changes the address in your clipboard in order to steal your bitcoin.

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 It is case sensitive! If you try to send bitcoin and if you mistakenly enter letter with wrong case, wallet shouldn't send the amount and you'll receive an invalid address error. 

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