Numbering new nodes
To number each node at the time it is created
For example, create a new node named "My tasks", set the Node Options to numbering, then create 3 child nodes using "My tasks" as the parent.  (Hint: Press Insert for the first node, then Shift+Insert for the remaining nodes.) You will find they will be numbered 1, 2 and 3 as follows:

Remember that you can always add text after, or even instead of, the number as the node title remains open for further editing.

Note that node numbers are allocated according to the new node's position in the subtree at the time it was created, so are quite different from Node IDs. Here we created three nodes, "Eat breakfast", "Feed the cat", "Take a shower", then turned automatic numbering on, deleted "Feed the cat", turned automatic numbering on, and replaced it with a new node created by selecting "Take a shower" and pressing Shift+Ctrl+Insert:

Fig. 3

Fig. 4
You can also number all nodes in an entire subtree in one go, please see Converting existing nodes to numbered nodes.
See also Setting the default node title
Since the number is allocated at the time the node is created, it does not change even if the node is moved up or down the subtree, thus may even be duplicated. For example, If we begin with the tree as shown in Fig. 5, then insert two sibling nodes in succession (Fig. 6 and 7) using "MyFirst" as the selected node in each case, they will both be allocated the number 2! To renumber nodes according to their current position in the tree, see Converting existing nodes to numbered nodes.
Fig. 5 Fig. 6 Fig. 7
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