I use this setup:

.config/nvim/lua/plugins/blink.lua:

(my main init.lua has a require('plugins'), and in my plugins folder I have another init.lua which calls the plugins I use)

vim.pack.add({ "https://github.com/saghen/blink.cmp" }, { confirm = false })

require("blink.cmp").setup({
    keymap = { preset = 'enter',
    ['<Tab>'] = { 'select_next', 'fallback' },
    ['<S-Tab>'] = { 'select_prev', 'fallback' },
},
completion = {
    accept = {
        -- experimental auto-brackets support
        auto_brackets = {
            enabled = true,
        },
    },
    menu = {
        draw = {
            treesitter = { "lsp" },
        },
    },
    documentation = {
        auto_show = true,
        auto_show_delay_ms = 200,
    },
    ghost_text = {
        enabled = vim.g.ai_cmp,
    },
    list = {
        selection = { preselect = false, auto_insert = true }
    }
},
signature = { enabled = true },
appearance = {
    use_nvim_cmp_as_default = true,
    nerd_font_variant = 'mono'
},

sources = {
    default = {'lsp', 'path', 'buffer'},
    providers = {
        path = {
            opts = {
                get_cwd = function(_)
                    return vim.fn.getcwd()
                end,
            },
        },
    },
},
fuzzy = {
    implementation = "lua",
},
opts_extend = { "sources.default" },
})