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Asalamualikum dear brother,
First of all "there will be no garbage values in correctly written code", but if you are new to development you should :
1. Write your own code I mean don't copy some ready made code available online
2. Start with simplicity and clarity.
3. Use online resources like w3school.
4. Before writting any code "Plan your code" first write a psedu or simple idea on a piece of paper.
5.Do some real world development.
Good luck.