Lol it more look like english lesson like the first time I came to the UK anyway the first thing we as foreign speakers find anoying is chat language it sounds rugh sometimes.
Anyway to extend the camera cable, the best is to use a BNC coupler if both heads are male. However most of the readymade cables are coming with male end BNC which plugs and twist to the camera connection. Using a Junction box (IP Box) next to the camera is recomended. The picture above is a coupler mainly used to join two cables together normally to extend the short cable. Imagine you run a 20m ready made cable and realise it is few meter short, then if you want to use another cable to extend then will need this coupler. yes the bad quality ones break nails! try the ones from connector co or UKSecurityShop.