Yes, You want to connect all the three reds together, but to nothing on your light fitting. So you'll need a piece of connector block, or a wago, etc
The Black on its own to left side of the image, is the switch wire and wants identifying with red or brown sleeve and goes to live on your fitting (Make sure you don't muddle it up with the other blacks or you'll create yourself a problem)
The two blacks on the right are the neutral and go to neutral on the new fitting.
All earths go to earth on the new fitting, but be careful, are are multiple earth wires sleeved in one bit of sleeving, and it looks like your fitting has either pushfit or lever connectors which want only one wire per entry, so you might be best off putting it in a connector block and running one earth to the terminal on the new fitting