Here is a search question: How to go about building a gravity engine? What are its principles? It seems a gravity engine would be able to use a form of attractive force rather than acceleration. How can this be found to be accurate? A vehicle with its own inert...

This website, put together by "Rocket", is a treasure trove of phenomenal information and additional links: https://gravitywarpdrive.com/

To the question: what is gravity, the answer has to ask another question: is gravity a product of mass or is it a particle in subatomic matter? https://www.gravitycentral.space/what-is-gravity

Here is a website about an interesting aspect of gravity. This is an area to explore, you have to copy and paste the link. https://bigthink.com/strange-maps/gravity-anomalies/?utm_medium=Social&utm_source=Facebook#Echobox=1673310095