I want to learn WordPress & Shopify speed optimisation

Hi, i need your tips n suggestions to learn speed optimisation, could you please help me where to start from ?

4 years back, this is how my blog performance used to be …

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Thank you @gulshan I’ll go through these posts.

Thanks for providing great solution for Ecommerce and blogs sites. I really apricate you. I have a question plz tell me how can I resolve response time less than zero.

This learning is very helpful for my structural engineer Sydney site but I need more help for my site. If you will help me then I shall appreciate to you.