Midterm elections take place every two years between presidential elections. All members of the House of Representatives are due for re-election. One-third of the total Senate is also up, but none in Illinois for 2018. There are gubernatorial contests, including Illinois, and initiative/referendum votes and more local elections taking place at the same time.
Elections in Illinois are run by the County Clerks for each county. You register and vote in the county of your legal residence. Students can generally register EITHER at their non-school residence (such as a parents house) OR your school residence. NOT both. Check with the county web site(s) below to see if and where you are registered.
Regular voter registration is closed, but there is a "grace period." Check with your county to see when and where Grace Period Registration is available.
"An independent fact-checking journalism website aimed at bringing you the truth in politics. Every fact-check includes analysis of the claim, an explanation of our reasoning and a list of links to all our sources."
"Collects political ads from the 2016 election. In addition to tracking airings across key primary states, the collection includes ads that may air elsewhere or exclusively on social media. The site also links to fact-checking and follow-the-money journalism."
Here are local (Champaign Urbana area) news sources, where you may find more information about issues and candidates.