Oracle sql developer software

Anyone know how to install oracle sql developer software?

Hi @Cuberoot

Check out the video link and docs

it shows me error unable to coonect

What us the error? Where do you need to connect? @Cuberoot

Status : Failure -Test failed: IO Error: The Network Adapter could not establish the connection (CONNECTION_ID=LKnP3mnrROGqffu2J9vRHw==)
Actually I am creating table manually but whenever I m open the application and creating it it shows this-

Execute Non Query: The ConnectionString property has not been initialized ?
How to resolve it