Kindly refer to the following links):
Guidelines to give Dawah to both Men & Women on Social Media
How to give dawah on social media when you don't have much knowledge about Islam
The guidelines when dealing with the opposite gender (non-mahram) due to necessity
Can I interact with girls in school in a language course?
How to lower gaze when you have to talk to non mahram women like doctor, teacher, receptionist
As Admin of a WhatsApp group is it my responsibility if someone posts unauthentic stuff
Can we join mixed-gender groups on Facebook, WhatsApp etc?
Can I talk to my online teacher (of the opposite gender) privately?
Talking to the opposite gender on social media? | Sheikh Assim Al Hakeem
Talk to opposite gender when they call | Sheikh Assim Al Hakeem