Generally the advice is that if you don't know them, ignore them. That said, linked in can be good for networking. I receive quite a number of messages on linked in form people that have no reason to contact me. These I ignore & see if they come back. I get some from students just wanting help. some I send info, others I just ignore. Many requests are just generated by linked in: They have so many things that look like requests form other people, but actually are just nudges from the system to keep things active. As as things that look like endorsement requests. So annoying. If someone is interested in my papers, I'll connect if they want to. It has never caused me too much trouble. Sometimes I get paper requests from people in countries where they can't easily get copies, but generally most people's recent papers are available online somewhere in my area. So many of these I ignore too. . Just my view. Other may have different opinions.

Thank you for your suggestion, Arman.

If their job is related to your field, as you said, I would connect to them and maybe ask them something I might need and if I got no respond from them I will disconnect to them. But some connection may become useful for the future. Maybe you can connect someone else that is more effective to you through them. generally, in my opinion, it depends on the person and you and the connection you want.