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by (2k points)
If so, do you mind sharing or selling? I'm really really new to this, but I also really want to learn and I've been trying all night.

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The offical Twine Cookbook includes a (Harlowe) Typewriter Effect recipe that shows one way to implement such an effect.

by (2k points)
Thanks, I saw it but it's too complicated for me atm, so I was wondering if anybody would take some of their time to explain me. I would pay this person for their service if needed since I understand that time is a valuable thing.
by (159k points)

The recipe is written in Twee Notation and is basically stating:

1. Add a new Passage to your project, name it Typewriter and place the following code within this passage.

    <!-- Create a variable to track the position within the $typewriterText string -->
    (set: $typewriterPos to 1)

    <!-- Create a hook to hold the typed text -->

    <!-- Set a delay of 20ms seconds per loop -->
    (live: 20ms)[

        <!-- Add the next character to the hook -->
        (append: ?typewriterOutput)[(print: $typewriterText's $typewriterPos)]

        <!-- Update the position -->
        (set: $typewriterPos to it + 1)

        <!-- If it's gone past the end, stop -->
        (if: $typewriterPos is $typewriterText's length + 1)[

2. Within the Passage of your project that you want to see the typewritter effect in use the (set:) macro to create a $typewriterText story cariable, then assign this variable the Text you want to the typewritter effect to display. Once you have done that used the (display:) macro to execute the code contained within the passage created in point 1.

(set: $typewriterText to "Hello, world!")
(display: "Typewriter")

When you view this passage of your project using either the Test or Play option the text contained within the $typewriterText should appear using the typewritter effect.