There is no such thing as “garbage” in God’s divinely inspired word… There are passages which its inherent meaning is harder to come by because of the cultural differences we have with the inspired authors, but nonetheless are God’s message to us.
There aren’t that many passages of violence throughout the OT, people tend to over-emphasize very small bits where that does happen (in percentage, it’s in about 3.4% of all versicles, if I remember correctly), but their meaning is ultimately coherent to the fulfilled Gospel. To have a full (or, at least, a bigger) understanding of these parts of Scripture, we could follow Origen’s advice to see these passages from the perspective of the Lamb, whose book locked with seven seals can only be open by the Lamb itself (I’m referencing the Book of Apocalypse, where this is said). This is more elaborated in this video.
Furthermore, check what exact type of book are you reading. The Bible is a library of sorts, not a book, so don’t treat it like it. All books are usually written by different authors, in different times, with different intentions. Treat each one individually. Don’t treat Genesis the same way you would treat the Chronicles, or Job the same way you would to Isaiah. There are books (like Isaiah) which are not directly intentioned to be read cover to cover because it’s not structured in that manner, while others (like Job) required you to do just that to make any sense of it - you get tottally different pictures if you just read the first 3 chapters of Job, than if you read the first 12, 30, or the whole 42 - the narrative develops in a linear manner, and things only start to make sense towards the end, having in mind what you’ve read up to that point.
These are just basic guidelines, but I hope I helped minimally. Any more specific questions, and I’ll see if I can answer them!