diff --git a/dvc/command/gc.py b/dvc/command/gc.py
index 7cbffc537..2ee4979d5 100644
--- a/dvc/command/gc.py
+++ b/dvc/command/gc.py
@@ -52,10 +52,10 @@ class CmdGC(CmdBase):
 
 
 def add_parser(subparsers, parent_parser):
-    GC_HELP = "Collect unused data from DVC cache or a remote storage."
+    GC_HELP = "Garbage collect unused objects from cache or remote storage."
     GC_DESCRIPTION = (
-        "Deletes all files in the cache or a remote which are not in\n"
-        "use by the specified git references (defaults to just HEAD)."
+        "Removes all files in the cache or a remote which are not in\n"
+        "use by the specified Git revisions (defaults to just HEAD)."
     )
     gc_parser = subparsers.add_parser(
         "gc",
diff --git a/dvc/command/get.py b/dvc/command/get.py
index e27c178b5..a0bc5186f 100644
--- a/dvc/command/get.py
+++ b/dvc/command/get.py
@@ -73,7 +73,7 @@ def add_parser(subparsers, parent_parser):
         "-o", "--out", nargs="?", help="Destination path to download files to"
     )
     get_parser.add_argument(
-        "--rev", nargs="?", help="Git revision (e.g. branch, tag, SHA)"
+        "--rev", nargs="?", help="Git revision (e.g. SHA, branch, tag)"
     )
     get_parser.add_argument(
         "--show-url",
diff --git a/dvc/command/imp.py b/dvc/command/imp.py
index 7d095dbd1..83ee0da7b 100644
--- a/dvc/command/imp.py
+++ b/dvc/command/imp.py
@@ -53,6 +53,6 @@ def add_parser(subparsers, parent_parser):
         "-o", "--out", nargs="?", help="Destination path to download files to"
     )
     import_parser.add_argument(
-        "--rev", nargs="?", help="Git revision (e.g. branch, tag, SHA)"
+        "--rev", nargs="?", help="Git revision (e.g. SHA, branch, tag)"
     )
     import_parser.set_defaults(func=CmdImport)
diff --git a/dvc/remote/base.py b/dvc/remote/base.py
index 33ec566bb..6096af65f 100644
--- a/dvc/remote/base.py
+++ b/dvc/remote/base.py
@@ -191,7 +191,7 @@ class RemoteBASE(object):
                 tasks,
                 total=len(file_infos),
                 unit="md5",
-                desc="Computing hashes (only done once)",
+                desc="Computing file checksum(s) (only done once)",
             ) as tasks:
                 checksums = dict(zip(file_infos, tasks))
         return checksums
diff --git a/dvc/scm/git/tree.py b/dvc/scm/git/tree.py
index 776d77c81..7933dee72 100644
--- a/dvc/scm/git/tree.py
+++ b/dvc/scm/git/tree.py
@@ -102,7 +102,7 @@ class GitTree(BaseTree):
             tree = self.git.tree(self.rev)
         except git.exc.BadName as exc:
             raise DvcException(
-                "revision '{}' not found in git '{}'".format(
+                "revision '{}' not found in Git '{}'".format(
                     self.rev, os.path.relpath(self.git.working_dir)
                 )
             ) from exc
diff --git a/dvc/version.py b/dvc/version.py
index d4bf622aa..0b2db6be5 100644
--- a/dvc/version.py
+++ b/dvc/version.py
@@ -57,7 +57,7 @@ def _is_release(dir_path, base_version):
 
 
 def _git_revision(dir_path):
-    """Get the SHA-1 of the HEAD of a git repository."""
+    """Get SHA of the HEAD of a Git repository."""
     return subprocess.check_output(
         ["git", "rev-parse", "HEAD"], cwd=dir_path
     ).strip()
diff --git a/scripts/completion/dvc.zsh b/scripts/completion/dvc.zsh
index 32bdef47f..6129fce0f 100644
--- a/scripts/completion/dvc.zsh
+++ b/scripts/completion/dvc.zsh
@@ -22,7 +22,7 @@ _dvc_commands() {
     "fetch:Fetch data files from a DVC remote storage."
     "get-url:Download or copy files from URL."
     "get:Download data from DVC repository."
-    "gc:Collect unused data from DVC cache or a remote storage."
+    "gc:Garbage collect unused objects from cache or remote storage."
     "import-url:Download or copy file from URL and take it under DVC control."
     "import:Download data from DVC repository and take it under DVC control."
     "init:Initialize DVC in the current directory."
@@ -117,7 +117,7 @@ _dvc_geturl=(
 
 _dvc_get=(
   {-o,--out}"[Destination path to put data to.]:OUT:_files -/"
-  "--rev[Git revision (e.g. branch, tag, SHA)]:Revision:"
+  "--rev[Git revision (e.g. SHA, branch, tag)]:Revision:"
   "--show-url[Returns path/url to the location in remote for given path]"
   "1:URL:"
   "2:Path:"
@@ -141,7 +141,7 @@ _dvc_importurl=(
 
 _dvc_import=(
   {-o,--out}"[Destination path to put data to.]:OUT:_files -/"
-  "--rev[DVC repository git revision.]:Commit hash:"
+  "--rev[Git revision (e.g. SHA, branch, tag)]:Commit hash:"
   "1:URL:"
   "2:Path:"
 )