I’m new to Minecraft and did a lot of googling but everyone has a different answer for silk touch.

Does anyone have a definite way to get it with an enchantment table?

Some say you need to be level 17 and have 9 bookshelves before it will show up (random). Others say you need to be between level 20 and 30. One says 30. Another says you can just keep trying over and over using a grindstone to remove the wrong enchantment before trying again.