简单地列一下 Golang 标准库中的包，知道他们是做什么的。

• archive 压缩相关
• archive/tar
• archive/zip
• bufio 带缓冲的 IO 操作 Golang bufio
• builtin 基础类型和内建函数
• bytes 字节数组（[]byte）的相关操作
• cmd
• cmd/addr2line
• cmd/api
• cmd/asm
• cmd/cgo
• cmd/compile
• cmd/cover
• cmd/dist
• cmd/doc
• cmd/fix
• cmd/go
• cmd/gofmt
• cmd/link
• cmd/nm
• cmd/objdump
• cmd/pack
• cmd/pprof
• cmd/test2json
• cmd/trace
• cmd/vet
• cmd/internal ...
• compress 压缩相关
• compress/bzip2
• compress/flate
• compress/gzip
• compress/lzw
• compress/zlib
• container 数据结构 Golang container 包
• container/heap
• container/list
• container/ring
• context 上下文
• crypto 加密算法相关
• crypto/aes
• crypto/cipher
• crypto/des
• crypto/dsa
• crypto/ecdsa
• crypto/ed25519
• crypto/elliptic
• crypto/hmac
• crypto/md5
• crypto/rand
• crypto/rc4
• crypto/rsa
• crypto/sha1
• crypto/sha256
• crypto/sha512
• crypto/subtle
• crypto/tls
• crypto/x509
  • crypto/x509/pkix
• database 数据库相关
• database/sql
  • database/sql/driver
• debug
• debug/dwarf
• debug/elf
• debug/gosym
• debug/macho
• debug/pe
• debug/plan9obj
• embed
• encoding 编码相关
• encoding/ascii85
• encoding/asn1
• encoding/base32
• encoding/base64
• encoding/binary
• encoding/csv
• encoding/gob
• encoding/hex
• encoding/json
• encoding/pem
• encoding/xml
• errors
• expvar
• flag 命令行参数
• fmt 格式化输出
• go
• go/ast
• go/build
  • go/build/constraint
• go/constant
• go/doc
• go/format
• go/importer
• go/parser
• go/printer
• go/scanner
• go/token
• go/types
• hash
• hash/adler32
• hash/crc32
• hash/crc64
• hash/fnv
• hash/maphash
• html
• html/template
• image
• image/color
  • image/color/palette
• image/draw
• image/gif
• image/jpeg
• image/png
• index
• index/suffixarray
• io
• io/fs
• io/ioutil
• log
• log/syslog
• math
• math/big
• math/bits
• math/cmplx
• math/rand
• mime
• mime/multipart
• mime/quotedprintable
• net 网络编程
• net/http HTTP
  • net/http/cgi
  • net/http/cookiejar
  • net/http/fcgi
  • net/http/httptest
  • net/http/httputil
  • net/http/pprof
• net/mail 邮件解析
• net/rpc
  • net/rpc/jsonrpc
• net/smtp SMTP 客户端
• net/textproto 文本协议，例如 SMTP
• net/url URL 解析和转义
• os
• os/exec
• os/signal
• os/user
• path 文件路径相关
• path/filepath
• plugin
• reflect
• regexp
• regexp/syntax
• runtime
• runtime/cgo
• runtime/debug
• runtime/metrics
• runtime/msan
• runtime/pprof
• runtime/race
• runtime/trace
• sort
• strconv
• strings
• sync
• sync/atomic
• syscall
• syscall/js
• testing
• testing/fstest
• testing/iotest
• testing/quick
• text
• text/scanner
• text/tabwriter
• text/template
  • text/template/parse
• time
• tzdata
• unicode
• unicode/utf16
• unicode/utf8
• unsafe
• internal
• internal/abi
• internal/buildcfg
• internal/bytealg
• internal/cfg
• internal/cpu
• internal/execabs
• internal/fmtsort
• internal/goexperiment
• internal/goroot
• internal/goversion
• internal/itoa
• internal/lazytemplate
• internal/nettrace
• internal/obscuretestdata
• internal/oserror
• internal/poll
• internal/profile
• internal/race
• internal/reflectlite
• internal/singleflight
• internal/syscall
  • internal/syscall/execenv
  • internal/syscall/unix
  • internal/syscall/windows
  • internal/syscall/windows/registry
  • internal/syscall/windows/sysdll
• internal/sysinfo
• internal/testenv
• internal/testlog
• internal/trace
• internal/unsafeheader
• internal/xcoff

• golang.dev/x/benchmarks
• golang.org/x/blog https://blog.golang.org
• golang.org/x/build https://build.golang.org
• golang.org/x/crypto
• golang.org/x/debug
• golang.org/x/image
• golang.org/x/mobile
• golang.org/x/net
• golang.org/x/perf
• golang.org/x/pkgsite https://pkg.go.dev
• golang.org/x/review Gerrit Code Review
• golang.org/x/sync
• golang.org/x/sys 系统调用
• golang.org/x/text
• golang.org/x/time
• golang.org/x/tools godoc, goimports, gorename, and other tools.
• golang.org/x/tour https://tour.golang.org
• golang.org/x/exp