Configuring Limit Web:
Click on the drop-down arrow to the right of the Limit Web button in the toolbar.
Select Configure Web Limiting... 
Select the Web Limiting tab.
Select Allowed Web Sites and add website addresses to those lists. Any sites that are not listed in the Allowed Web Sites list will be blocked. You can add additional sites to this list if they are needed for curriculum and students are blocked from accessing them.

Once the allowed list has been configured, make sure to highlight all student computer and click the dropdown arrow next to web limited. Make sure “Allow list” is checked.

Adding Websites to the List:
When adding websites to the Allowed or Blocked lists, start by entering only the site's domain name to allow or block the entire site (e.g. facebook.com, google.com).
Entering a more specific website address (e.g. mail.google.com, en.wikipedia.org) will only block or allow that specific part of the website.

There is a 30,000 character limit or 1400 bytes.
Examples:
Add to Blocked Sites: facebook.com  Result: All parts of facebook.com will blocked.
Add to Blocked Sites: mail.google.com  Result: All parts of mail.google.com will be blocked, but docs.google.com will be allowed
Add to Allowed Sites: docs.google.com/document/d/1llCNxxxxx  Result: This specific Google Doc link will be allowed. All others will be blocked.

Start by adding these sites, which are used in the curriculum. Other sites can be added as needed with the method shown above.

3pitech.com

898.tv

acs.org

adobe.com

akc.org

amazonaws.com

angularjs.org

apple.com

arcgis.com

archaeological.org

arckit.com

arduino.cc

armsmag.com

artofcomposing.com

autodesk.com

berkeley.edu

bls.gov

bobsredtrucks.com

bohemiancoding.com

bostondynamics.com

bridgecontest.org

britannica.com

browsehappy.com

bsmny.org

butchartgardens.com

by.me

byjus.com

californiasolarcenter.org

canva.com

canvas3d.io

carbide3d.com

careerexplorer.com

careergirls.org

cateater.com

ck12.org

ckeditor.com

cksource.com

cloudinary.com

codeduino.com

colorado.edu

colormatters.com

commonsense.org

consumerreports.org

corestandards.org

creativebloq.com

creativecommons.org

csswizardry.com

d2l.com

d3js.org

dailymotion.com

daisy.org

data-flair.training

desmos.com

digitalmarketer.com

doink.com

earthday.org

edfenergy.com

eia.gov

ejohn.org

electronicshub.org

elenco.com

energy.gov

energyeducation.ca

energymatters.com.au

energysage.com

energystar.gov

energyusecalculator.com

enjoyalgorithms.com

envato.com

environmentalscience.org

epa.gov

esri.com

ezvid.com

fablevisiongames.com

fablevisionlearning.com

fabmakerstudio.com

fastly.net

fatbraintoys.com

fischertechnik.de

flatironschool.com

fontawesome.com

forms.gle

fractalfoundation.org

freescreenrecording.com

freesound.org

gamedesigning.org

garrettsbridges.com

geeksforgeeks.org

geogebra.com

geogebra.org

getepic.com

gitbook.io

github.com

github.io

globalsolaratlas.info

gnu.org

gocomics.com

google.com

granta-automation.co.uk

graphicalanalysis.app

greetingcard.org

guinnessworldrecords.com

harvard.edu

healthline.com

helpdocs.io

hgtv.com

hikingproject.com

history.com

hubblesite.org

idangero.us

idpf.org

incompetech.com

indeed.com

infoplease.com

inkling.com

instructables.com

instructions.online

istockphoto.com

ixl.com

jquery.com

jqueryui.com

keydifferences.com

khanacademy.org

kickstarter.com

kidsweatherreport.com

kitchenaid220.com

knightlab.com

kodugamelab.com

landscape-design-advice.com

lco.global

learn.org

learnhowtobecome.org

learningfarm.com

lifewire.com

livescience.com

localharvest.org

loom.com

lumenlearning.com

makecode.com

makewonder.com

makeymakey.com

mashupmath.com

mathbootcamps.com

mathplayground.com

mathsisfun.com

microbit.org

microsoft.com

miencompany.com

miro.com

mit.edu

molamodel.com

mosaicmfg.com

move.org

mozilla.org

mutts.com

myminifactory.com

napo.net

nasa.gov

nationalgeographic.com

ncbdc.com

nchsoftware.com

ncsu.edu

neit.edu

nist.gov

noaa.gov

nodejs.org

nps.gov

nrel.gov

oercommons.org

office.com

onlinemathlearning.com

openstreetmap.org

osha.gov

ozoblockly.com

padcaster.com

paletton.com

pbs.org

pbskids.org

peanuts.com

pi-top.com

pinshape.com

pixabay.com

punchsoftware.com

purdue.edu

purl.org

python.org

reallysketch.com

robolink.com

saa.org

safekids.org

salt.ac.za

sciencebuddies.org

sfgate.com

simplemotor.com

sketch.io

sketchup.com

skoogmusic.com

skyscrapercenter.com

smartlablearning.com

socscistatistics.com

soundbible.com

soundcloud.com

space.com

sparkfun.com

sphero.com

squishycircuits.com

stamen.com

stellarium.org

stopmotionstudio.com

storyofstuff.org

stsci.edu

teachhub.com

teamviewer.com

tech4learning.com

thegraphpaper.com

thepocketlab.com

thingiverse.com

thisreadingmama.com

thoughtco.com

timeanddate.com

tinkercad.com

treehugger.com

tutsplus.com

ubtrobot.com

ucdavis.edu

url.com

usatoday.com

usclimatedata.com

usgbc.org

usnews.com

varsitytutors.com

vernier.com

vimeo.com

vine.co

virtualnerd.com

w3.org

w3schools.com

washington.edu

weather.com

weather.gov

webkit.org

wikimedia.org

wikipedia.org

windows.net

windows2universe.org

withgoogle.com

wixie.com

wonderopolis.org

wordpress.com

youtu.be

youtube-nocookie.com

zippia.com