Having an ILR means you are free to choose work and study of your own choice. You can also seek self employment unrestricted. You are able to access UK public funds. You are able to access the healthcare and medical facilities, with minimum exceptions. Many visas allow you to apply for citizenship right after fulfilling your 5 years residence period, like skilled worker visa, sole rep visa, UK ancestry visa, investor visa, Global talent visa. Individuals wedded to British residents might have the option to apply for citizenship following acquiring ILR after 3 years.
Read More: What does it mean holding a UK ILR