I would like to talk about the advantages and inconvenients of the Internet.
I would like to talk about the advantages and disadvantages of the Internet.
Many people say that television has a lot of inconvenients.
Many people say that television has a lot of disadvantages.
Inconvenient is an adjective, not a noun. Do not use it with a/an or make it plural: ‘It is very inconvenient to have builders working in your house.’
Use the noun disadvantage for a negative feature or point: ‘One disadvantage of the Internet is that it can be distracting.’
The noun inconvenience means a problem that causes difficulty or extra work: ‘We apologise for the inconvenience.’