So I am a newbie just learning networking and was wondering if gateway can be same as the allocated IP address. Also, if I have to increase the number of users that connect to my router (having default mask 255.255.255.0) can I do that by changing the default mask to something like 255.255.248.0 or any other? Please help me out. Thanks.
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No, it cannot be the same.
Yes, you can change netmask, but you need to do that on every computer/device having an IP address on the network, otherwise part of the machines in the network cannot be reached.
Tero Kilkanen
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