How do I connect tow PCs by ethernet cable,so they can share resources

How do I connect tow PCs by ethernet cable,so they can share resources
The answer depends on what you are trying to share.

If by Resources you mean the internet, you'll need to get a home router to connect to those ethernet jacks. I use a Linksys to connect all my PCs to my one internet connection.

If you only need to share a printer or some files from one PC to another, you could accomplish this with a cross-over ethernet cable. You will need to take some steps to share the resources, but it would be a cheap solution and shouldn't be too difficult.