Deploy solutions in Sharepoint

We need to deploy solutions in SharePoint through wsps.

There are generally 2 commands :

First is to Add the solution ,then to install solution .

Using the below msdn link the solution can be updated

https://technet.microsoft.com/en-us/library/ff607534.aspx

https://technet.microsoft.com/en-us/library/ff607552.aspx

However,if the deployment still shows error we can use -FulltrustBinDeployment with -Force.

Incase any code modification is done,we need to upgrade wsp. and not deploy the entire solution.