I want to test my website to see whether the template is good or not and whether there is an error.
A good start is to use pagespeed and browser itself. These will keep you busy for some time…
- https://pagespeed.web.dev
- Chrome browser > Right click and Examine (different browser other name)
“Best Practice” indicates that you have few or no errors in your code. So focus on speed instead. Behind “Performance” it may be both program issues as well as heavy images etc.
I have seen “professional” web sites that is worse 
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