I'm sure there are LOTS of "free" and "pay" websites where you can learn what "Synthesizers" are and how to use them. The following two links are websites that I recently found.
This first web page allows you to learn about Synthesizers by interacting with some of their main components. Sure, this "interaction" is simply on a computer screen and not turning Knobs, flipping Switches or moving Sliders like you would in a typical "Hardware" Synth… and it's not the same as interacting with an on-screen "Soft Synth". However, the confusing aspects of Synthesizers is removed, allowing you to focus on the one, two or more parameters you're learning about.
If you're new to Synthesizers, going through these pages can help you gain an understanding of how they create and modify various sounds. Most of what you are changing on each page is explained. However, see if you actually "understand" the difference between a "Pitch" and a "Filter" change… a Low Frequency Oscillator (LFO) controlling a sound and an Envelope Generator controlling a sound, etc.
Don't take this too seriously, though. Synthesizers are a lot of fun to experiment with.
This next web page builds on "what Synthesizers can do" and shows how they can be used to modify sound created with other Instruments, such as Guitar, Violin and Saxophone. The three short videos on the following page provide examples of this.
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