Genre Savvy Tips for an Investigator
Spoilers. Please mark Mask Spoilers.
Beware basements its very common for dark things in the earth to hide there.
Its very common for a curse to be passed down over a family line.
Eldritch things have to come from somewhere; either they are native to the area or someone brought them in. Keep this in kind. Rarely its a mixture of both. For this reason characters who do a lot of travelling especially to remote regions are subjects of interest.
It's moderately common for people to use lovecraftian creatures to distill drugs.
Very few things have an immunity to fire; moltov cocktails can come in handy when something appears bullet proof.
Always be careful how you deploy your car as being able to use it to flee can be a matter of life and death. An ambush there or having it sabotaged can be fatal.
Dont take rumors at face value (although dont dismiss them out of hand either) they often contain red herrings.
Any other ones to add?