Well, i do Customer Support for a dating site for a living. The first recommendation is not to contact people outside of the site as soon as you meet them, the ones that do are more likely than not to be scammers/people you don't want to relate to; these people usually have their profiles removed/banned in two days tops. If their profile is still up after the week, it's safer.
Always do a reverse image search on either google or tineye on matches that too good to be true or names on scam sites like romancescam. Also on profiles that use many adjectives to describe themselves or what they are looking for, keywords are: honest, god fearing, kind, loving; usually in succession.
Do not follow links hidden on html, or sites that require your log in information, especially if sent on the first email with the excuse of seeing their photos or that there is something wrong or shocking in your profiles; some even say that they found naked photos of you. Highly scam. I use WOT to inform me of potentially dangerous site, it's member managed so not all sites are curated.
Avoid multi background engineers that became widows due to untimely death of their wives and whose child is abroad with either families or studying (yes, all that together). For example: my father is american, my mother australian but i was raised in europe, [wife was a great women][tragic sudden death story][hope spot][looking for love again].
And finally, if you ever get in contact with one scammer, when you cut them off some will curse, others will threaten you, very few will go as far as harass you but keep in mind that they cannot harm you, they are only bluffing so you give them money or send them expensive cellphones or laptops or cash the last fish's money, they are away on another country unable to do anything to you. Ignoring them will make them go away because they will not loose time on a lost cause when there are more fishes in the sea.
As alarmist as I sound, it's because I only see the dark side of this. You are safe because you are way below the 50+ year old people they target.
Finally, have fun and good luck finding someone special :)