The links listed below will take you to websites where you can download sounds for free as long as you are not selling them or sharing the files.  You can use them on a website, or in a school project. 
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JamStudio
Create your own music.  No musical background required.  Create original pieces to add to multimedia projects.
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BeatLab - Log in with Google and create music. Easy to use and then you can save your creations to drive.
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Noteflight
Free. Create, view, hear and print music.
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BBC Sound Effects - The 16,000 Sound Effects on this website are BBC copyright, but they may be used for personal, educational or research purposes.