My blogger design corrupts everytime I add javascript and Design corrupted

I am a beginner in programming. Recently, I tried and spent 2-3 days in changing my blogger template but I cant succeed. Most of tags in the code become corrupted when I upload template for example < changes into &#lt;

I tried many free templates but even a single template doesnt work.
My blog link is

Please if anyone can detect the error or help me in any way I would be much thankful. The template that I am using is

Thanks in advance.

Source: html

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