What is the best S&P 500 index fund?

I'm interested in investing in the S&P 500, but I'm not sure which index fund is the best option. Could you please provide some guidance on how to choose the best S&P 500 index fund, taking into consideration factors such as fees, performance, and ease of access? Also, are there any particular funds that you would recommend based on your expertise in the field? I'm looking for a fund that can help me achieve long-term growth while minimizing costs and risks. Thank you for your help.