Hello there guys so the new normal in our time is an online class and i know that everyone is adjusting to this kind of set up . I want to help you guys with it so i will share some sites that i know that can help you in the online class and the sites that i am showing are all free and i all tested it so here it is ...
1.quillbot.com - having a hard time paraphrasing? Well this site can help you . You will just copy the sentence or phrase you need to paraphrase then it is all done . ; )
2.khanacademy.org - if you are college students or incoming college students this site can help you learn more about the subject of your courses you desired or course that you are taking . 
3.simplemind.eu - if you want to review through mind mapping this is the best site can help you with it.
I have many sites to share so comment on my post if need more ; > and also give me more 🖐 hihi . And lastly i just put short description to the sites so i can let you explore it on your own and comment if you discover more .lovelots 💓