looks like some cat cables - (lan cables)
some rg6 cables (tv)
if you want just wifi and lan from the router, ont in cabinet - lan link to location in house - router in location in house
if you want many wired lan ports, if you have 2 lan cables going to one location, you can use one as a loop back if your router is located in house somewhere, if you dont have that, a powerline av kit can acheive this, bring the live lan back to the cabinet, then a small switch to connect all the cables to the lan,
rg6 is for the tv if you want to have freeview or sky the appropriate tech will use these cables,
many possabilities,
your cabinet is very small, most are much larger, can hold a ont and router and patch panel, i would reccommend you only store ont in a cabinet that size. some people use floating shelf above cabinet to hold a router, but be careful not to screw into cables behind the wall, usually cables go straight up from where they come out of the wall.