How to do deployment through Changesets in Salesforce

Step1:
Login into the Sandox and then follow the below

Setup > Depoly > Outbound changeset > create new changeset > add components(Let say classes,pages etc.,) > Upload

Then logout from sandbox.

Step2:

Login into the Production

Setup > Depoly > Inbound changeset > Validate > Deploy

Note:
1.From Sandbox Just create outbound changeset and in the Production receive the Inbound changeset.
2.If any of them failed due to any reason the total will be rolled back.