back around 50-70AD a couple of guys recorded the life and teachings of Christ in what we call the Gospels of Matthew, Mark, Luke and John
around the same time some of the apostles wrote letters to the early Christian churches, in places like Rome and Corinth, teaching doctrine that was to be shared with every believer, and these 'Epistles' were copied and shared to every place that had a Christian fellowship
the early christians copied these Gospels and Epistles so prolifically that many, many individuals had personal copies of their own, and since they were written in common Greek - the language that was used throughout the then vast Roman Empire - it was easy for the message contained to be understood and spread everywhere
now the reason we know that many individuals had copies of the New Testament, is because for the first 300 years of Christ's Kingdom, the Church was under immense persecution with many followers of The Way being rounded up and murdered by the Roman State… but they valued the Scripture so highly that they hid their New Testaments in clay jars and buried them, whole families being destroyed so no-one ever returned to retrieve the manuscripts; and in the last 150 years we have uncovered over 5000 of these early manuscripts – that vast number pointing to so many, many more having been created, but because they were never preserved in clay pots, they fell to dust millennia ago
(as a side note, those 5K manuscripts date to the 2nd Century: 100-200AD)
now here's the thing, back when the New Testament was first translated into English between the 1400s - 1600s, there were only around 3 Greek manuscripts, and quite a lot of work from a man called Erasmus, from which to draw an understanding of what the Author intended, so we have Wycliffe's Bible and the Geneva Bible and latterly the King James Bible all doing their best from a very small pool of text
but y'know what, if we look at a more modern English translation like the NAS or the ESV which attempt to draw from over 5000 more manuscripts than what a man like Wycliffe had, can you guess how many major doctrinal differences there are between them ?
none
now that's not to say that there aren't a couple of passages missing from early manuscripts, which we see later on – like the Pericope Adultarae where Jesus is alleged to have said to a crowd about to stone an adulteress that only the first without sin could stone her… but of the very few contested passages like that, none of them affect any salvific doctrine so it's not a major concern to the believer who wants to know how to make peace with God
and moreover, i would argue that even if we didn't have those 5.8K early manuscripts, nor an amazing amount of letters between the early christians Fathers who quoted the New Testament to each other so much that we can piece together the entirety of the Old Testament and New at least several times over, with only about 6 verses missing – yes even if we didn't have that, we have Christ the King who promised not one jot nor tittle would pass away from His word
this is especially comforting because from what we read of Christ demanding that men know what is written in Scripture, beginning all arguments with His interlocuters "Have you not read…" we should recognise the value of the Bible for being the vast treasure-house it is, full equipping the believer for every good work foreordained from before the beginning of the world for him to do
and you should prayerfully trust this same Lord God and Christ to teach you everything He demands you know of Him in whatever translation of the Bible you find easiest to read
tl;dr esv
oh and btw, if the same Lord God, Jesus Christ, saw fit to have whole families of believers murdered so as to preserve their Bibles in clay jars for 2000 years, just so you could get your grubby little hands on a decent translation… don't you think you really ought to take Scripture very seriously indeed ?