Just as there are several possible ways to run Node-RED, there are several ways to access the log.
There are several possible ways to install Node-RED, this post provides an overview and some thoughts about when you might want to use which approach.
There are all sorts of reasons to want to run more than a single instance of Node-RED and several ways to do it.
There are usually many ways to achieve something in Node-RED. A common question is whether or when to use a function node or a collection of core nodes to achieve an outcome.