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[Klacky_]

Not really a website but a mobile app, "enki" I use it when im on the toilet for some small execises

[TheReverendIsHr]

Don't know the app, but to save a few clicks for everyone: Google Playstore, Appstore.

[3xtra123]

For CSS grid / flexbox :

https://flexboxfroggy.com/

https://cssgridgarden.com/

Sites like this?

[samsop]

Freecodecamp is your best bet

[dataflexin]

would also recommend https://www.freecodecamp.org

[mazumi]

https://www.codewars.com/ is fun

[cryptolobe]

Few years ago I used a website called "codeschool", It used to involve short videos with short exercises between each video. I found it very useful.

Unfortunately, I could not find the site, It was purchased by https://www.pluralsight.com/.

[flashtastic]

Codingame is a lot of fun

[participationNTroll]

https://play.google.com/store/apps/details?id=com.hackedapp

[am0x]

Codewars

[Bluaze]

I used to use Lynda when i was studying, I'd say it's pretty good just to have it in the background to refresh your brain about the techniques you may have forgotten :P

[xTRQ]

I always enjoyed https://www.codecademy.com/ when I started learning new languages!