An aspect of the Troubles that many British people don't know about is the collusion of British army/security forces with loyalist paramilitaries, including in the car bombs set off in Dublin and Monaghan in 1974.
This resource lists everyone killed year by year: cain.ulster.ac.uk/sutton/chron/index.html
The names of the 3700 who died in the Troubles are read out in Dublin every year to mark the anniversary of the Good Friday Agreement - unbearably moving, and takes three hours or so to read them all out. The largest single loss of life in one day was only c.30 people (some died the next day) so 3700 represents thousands of small incidents, indicating the pervasive violence of those years.
These deaths are why so many Irish people are completely appalled at the prospect of Brexit. The shitshow that will be unleashed on British and Irish economies etc is one thing that some Brexiteers might misguidedly defend but there is absolutely no (falsely perceived) benefit that can make up for the return of a hard border and it will severely damage the peace and the good relations between Britain and Ireland. It's completely depressing and frustrating that an internal fight in the Tory party and a campaign fought with lies and dirty money has led us to here.