Here is our tip for the day!
If you are sewing heavy layers of fabrics on the sewing machine, use a denim or jeans sewing needle.
This will prevent the fabric from being pushed into the dog-feed or into the bobbin feed of the sewing machine and causing screeching noise.
*If you have the singer Serenade C520L Sewing Machine that sold at Lidl, if you are hearing a screeching noise when sewing layers of fabric then use a jeans sewing needle instead. You can also sew knitwear with the jeans sewing needle.