This is an official ODERSA website. Here’s how you know

The official domain

The address of this site ends in odersa.org. Every service the association runs sits on a subdomain of odersa.org and nowhere else. If the address in your browser’s address bar does not end in odersa.org, this site is not ours.

Free, and no account

Everything is open straight away. No sign-up, no account, no password, no subscription, no advertising. Nothing is held back for those who pay, because there is nothing to pay for.

No data collected

This site does not follow you: no tracker, no tracking cookie, no measurement tool built into these pages, and nothing measured on your device. Our host counts requests in aggregate, as any server that answers does: a total, never a profile. You do not have to take our word for it: open your browser’s developer tools, go to the Network tab, and reload the page. You will see the full list of what the site asks for. Everything comes from odersa.org, nothing goes anywhere else.

Free to reuse

The content is published under the CC BY 4.0 license. You may copy it, translate it, print it and pass it on, for your classes as much as for the people around you, on one condition only: credit ODERSA.

A site by ODERSAA nonprofit association under French law (loi 1901) that makes education accessible to everyone, free of charge and with nothing asked in return.

One by one

The 8 reflexes

Apps change their look every six months. The traps, though, have looked the same for ten years. Here are the 8 phrases that run through every skill on the site: each exercise works on two or three of them, and over time they come to mind without even thinking.

I look at WHO is speaking

A displayed name is just text, so it can be copied. What matters is the exact address of the sender, or their phone number. A delivery announced from an unknown mobile number is not a delivery.

A code I receive is never given to anyone

A one time code received by text message proves that it is really you. No advisor, no delivery driver, no service will ever ask for it. Giving it away opens the door in your place.

One account, one door: every door has its own key

A password reused everywhere turns one leak into a break in everywhere. A long passphrase for each important account, written down somewhere safe, holds up better than a complicated password used again and again.

The padlock is not enough: I read the address

The little padlock icon means the connection is encrypted, not that the site is honest. A scam site has one too. The name of the site sits just before the first forward slash: that is where to look.

Why phrases, not rules

A technical rule ages fast: a button's name changes, a menu moves, an app disappears. A phrase, on the other hand, stays useful even when the screen no longer looks like anything familiar.

These eight phrases are written in the first person, in the present tense, and they're deliberately short: they need to fit in your head at the moment someone is pressuring you. That's when they matter most.

Keyboard shortcuts

Tab
Move to the next item
Enter or Space
Tap the selected item in the exercise
Escape
Close the settings panel
?
Show this help