How can i increase Nodes and how to configure Replicas and shards

Elastic Stack Elasticsearch
1

I have only one Node in elastic Search how can i increase Nodes and how to configure Replicas and shards

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2

Start a new machine.
Install elasticsearch
Configure elasticsearch.yml
Start

You also need to restart the first node if you did not set network.hosts

3

Sir any reference how to configure elasticsearch.yml.

4

Did you look at the documentation?

There is a very big section about installing elasticsearch: https://www.elastic.co/guide/en/elasticsearch/reference/current/setup.html

And this will lead you to this page: https://www.elastic.co/guide/en/elasticsearch/reference/current/important-settings.html