How to generate SVG animation?

Question

SVG

Example codepen.io/FabioG/pen/MaZpJp
It is clear that the block is responsible for the animation

<svg viewBox="0 0 3387 1270">
<path id="planePath" class="planePath" d="M-226 626c439,
4 636,-213 934,-225 755,-31 602,769 1334,658 562,-86 668,
-698 266,-908 -401,-210 -893,189 -632,630 260,441 747,
121 1051,91 360,-36 889,179 889,179" />

Obviously, numbers are not written by hand ...
With the help of what software are such sequences generated for animating objects, writing text, etc.?

Answer 1

https://svg-edit.github.io/svgedit/releases/svg-ed...
In general, in any svg editor and then translate into html

Answer 2

Hands and only) This is not some simple html

Answer 3

Here is an unpretentious editor appeared the other day on beta testing: link , try it)