When creating or editing a project if you don't specify a project ID, one will be created automatically based on the first letters of the project name.

For example: a project with the name "Amazon Store" will be AS. If I add another project named "Apple Store", the project ID will be AS-1.

Otherwise, you can change it whenever you want by going to project settings (the gear icon on top of the project) → Advanced Project Settings

When creating a task, you'll notice that a task ID will be created automatically based off the project ID. Hence the only way to change a task ID is to change the project ID. 

NOTE: When moving the task to a different project, the task ID will be changed based on the new project ID. Task IDs are incremental and unique for that project.
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