What is the difference between an agent and a node in a jenkins pipeline?

Node: A Pipeline performs most of the work in the context of one or more declared node steps.

Agent: The agent directive specifies where the entire Pipeline, or a specific stage, will execute in the Jenkins environment depending on where the agent directive is placed.

So both are used for executing pipeline steps. But when to use which one?

Jenkins pipeline: agent vs node?

I'd like to know if exists a plugin for jenkins to collect data produced by my pipeline steps and visualize them as graph. I need also keep data for the future, so that each future pipeline can analyze the trend over time to compare old and new results.

Jenkins plugin to collect and visualize data

I have a declarative pipeline jenkinsfile, in which I have 4 stages. I would like to make so that whenever a specific stage executes(this stage is conditional therefor it will not always execute), all stages after this one are skipped. For example purposes let's say that this stage is the first stage. Does anyone knows a way to do it in a declarative pipeline? 

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