I am living in a poor country but I have managed to get admission for a PhD program in Western Europe. This was a daunting task for me due to my family background and also social conditions. ( I don't feel like elaborating on this) . Also , I never had much guidance in mathematics and motivation was intristic. What motivated me was that I always liked studying mathematics and wanted to study it more, try problems and work on some problem and do research. I am working on an area of Pure mathematics.

Can you please share with me resources ( books/ blogs/ websites/ videos) about what I should need to know and what will definitely help me to do good research in mathematics ( for PhD and beyond)?

There might be no best answer for this but it will be best for me ( and hopefully future visitors, there might be more people like me with less guidance and fortune) as many resources are mentioned in comments and answers.

I shall be thankful for any guidance/advice received.

Thank you!