How to change a website template without losing SEO rankings

[williamsreus1]

I bought a theme on themeforest and planning to change for the current theme on my blog, my blog has keywords on first page of Google search results but as I have read information on this forum, if on-page SEO factors are changed then it can affect to keyword rankings of a website on SERPs. My question is, how can I change my website template but still keep rankings in Google?

[salena]

The first thing you must do is think about SEO. Too often clients don't stop to consider the SEO impact of changing their website. They chuck away valuable content from historical pages or decide it would be a good idea to completely change every single URL without redirecting the old ones.
This only happens because they misunderstand how Google et al. read a website and how URLs hold credibility. It’s no fault of their own, but it happens.

[kumarsatish]

Great information thanks for sharing with us