diff --git a/docs/action-versioning.md b/docs/action-versioning.md
index 88ca2a89..a8f7e7e8 100644
--- a/docs/action-versioning.md
+++ b/docs/action-versioning.md
@@ -13,9 +13,9 @@ steps:
 
 Binding to the immutable sha1 of a released version is the safest for stability and security.
 
-Binding to a specific major version allows for receiving critical fixes and security patches while still mainting compatibility and the assurance your workflow should still work.
+Binding to a specific major version allows for receiving critical fixes and security patches while still maintaining compatibility and the assurance your workflow should still work.
 
-Binding to master is convenient but if a new major version is released which breaks compatilibility, your workflow could break. 
+Binding to master is convenient but if a new major version is released which breaks compatibility, your workflow could break. 
 
 # Recommendations
 
diff --git a/docs/javascript-action.md b/docs/javascript-action.md
index 75a6a615..c83c6182 100644
--- a/docs/javascript-action.md
+++ b/docs/javascript-action.md
@@ -117,7 +117,7 @@ $ git checkout -b v1-release
 
 > NOTE: We will provide tooling and an action to automate this soon.
 
-Checkin production dependencies:
+Check in production dependencies:
 1. **Do not ignore node_modules**:  Add a `!` in front of the `node_modules` line.
 2. **Delete node_modules**: rm -Rf node_modules
 3. **Install production dependencies**: npm install --production
diff --git a/packages/core/README.md b/packages/core/README.md
index ade0b6f3..2ad866ac 100644
--- a/packages/core/README.md
+++ b/packages/core/README.md
@@ -70,7 +70,7 @@ try {
   core.debug('Inside try block');
   
   if (!myInput) {
-    core.warning('myInput wasnt set');
+    core.warning('myInput was not set');
   }
   
   // Do stuff
diff --git a/packages/core/__tests__/lib.test.ts b/packages/core/__tests__/lib.test.ts
index 43ee4a83..48ea14b4 100644
--- a/packages/core/__tests__/lib.test.ts
+++ b/packages/core/__tests__/lib.test.ts
@@ -16,7 +16,7 @@ const testEnvVars = {
   // Set inputs
   INPUT_MY_INPUT: 'val',
   INPUT_MISSING: '',
-  'INPUT_SPECIAL_CHARS_\'\t"\\': '\'\t"\\ repsonse '
+  'INPUT_SPECIAL_CHARS_\'\t"\\': '\'\t"\\ response '
 }
 
 describe('@actions/core', () => {
@@ -101,7 +101,7 @@ describe('@actions/core', () => {
     )
   })
 
-  it('getInput doesnt throw on missing non-required input', () => {
+  it('getInput does not throw on missing non-required input', () => {
     expect(core.getInput('missing', {required: false})).toBe('')
   })
 
@@ -110,7 +110,7 @@ describe('@actions/core', () => {
   })
 
   it('getInput handles special characters', () => {
-    expect(core.getInput('special chars_\'\t"\\')).toBe('\'\t"\\ repsonse')
+    expect(core.getInput('special chars_\'\t"\\')).toBe('\'\t"\\ response')
   })
 
   it('setOutput produces the correct command', () => {
diff --git a/packages/core/src/command.ts b/packages/core/src/command.ts
index 73c27aed..c3cb7058 100644
--- a/packages/core/src/command.ts
+++ b/packages/core/src/command.ts
@@ -14,7 +14,7 @@ interface CommandProperties {
  *
  * Examples:
  *   ##[warning]This is the user warning message
- *   ##[set-secret name=mypassword]definatelyNotAPassword!
+ *   ##[set-secret name=mypassword]definitelyNotAPassword!
  */
 export function issueCommand(
   command: string,
diff --git a/packages/exec/src/toolrunner.ts b/packages/exec/src/toolrunner.ts
index 206015b3..32dc5f94 100644
--- a/packages/exec/src/toolrunner.ts
+++ b/packages/exec/src/toolrunner.ts
@@ -216,7 +216,7 @@ export class ToolRunner extends events.EventEmitter {
     //    command line from libuv quoting rules would look like:
     //          foo.exe "myarg:\"my val\""
     //
-    // 3) double-up slashes that preceed a quote,
+    // 3) double-up slashes that precede a quote,
     //    e.g.  hello \world    => "hello \world"
     //          hello\"world    => "hello\\""world"
     //          hello\\"world   => "hello\\\\""world"
diff --git a/packages/io/__tests__/io.test.ts b/packages/io/__tests__/io.test.ts
index 1c6aea87..3fd12ea7 100644
--- a/packages/io/__tests__/io.test.ts
+++ b/packages/io/__tests__/io.test.ts
@@ -88,7 +88,7 @@ describe('cp', () => {
   })
 
   it('copies directory into non-existing destination with -r', async () => {
-    const root: string = path.join(getTestTemp(), 'cp_with_-r_nonexisting_dest')
+    const root: string = path.join(getTestTemp(), 'cp_with_-r_nonexistent_dest')
     const sourceFolder: string = path.join(root, 'cp_source')
     const sourceFile: string = path.join(sourceFolder, 'cp_source_file')
 
@@ -245,7 +245,7 @@ describe('mv', () => {
   it('moves directory into non-existing destination', async () => {
     const root: string = path.join(
       getTestTemp(),
-      ' mv_with_-r_nonexisting_dest'
+      ' mv_with_-r_nonexistent_dest'
     )
     const sourceFolder: string = path.join(root, ' mv_source')
     const sourceFile: string = path.join(sourceFolder, ' mv_source_file')
@@ -321,7 +321,7 @@ describe('rmRF', () => {
     await assertNotExists(testPath)
   })
 
-  it('removes folder that doesnt exist with rmRF', async () => {
+  it('removes folder that does not exist with rmRF', async () => {
     const testPath = path.join(getTestTemp(), 'testFolder')
     await assertNotExists(testPath)