why when there is any kind of light it makes my textures look like garbage please help i am very new
There are several things you can do :
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You can try lower the intensity of the light to make the shadow of the grass less intense
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If you think the quality of the texture imported is fairly shit then you can select the texture and play around with the settings over there. For example the under format, truecolor is the highest quality import setting (but it comes with a price (processing power)).
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You can play with other settings like shadows and all for a suitable feel you want for the game.