https://learn-islam.org/
khanacademy.org

The link given above is an Islamic channel link, and the second link is a site where you can learn for free (Millions+ uses)

Islamic projects for Muslims to benefit from

ᴀʟʟᴀʜ ɪs ᴍʏ ʟᴏʀᴅ ☪
ɪsʟᴀᴍ ɪs ᴍʏ ʟɪғᴇ
ǫᴜʀᴀɴ ɪs ᴍʏ ɢᴜɪᴅᴇ
ᴘʀᴏᴘʜᴇᴛ ɪs ᴍʏ ᴍᴏᴅᴇʟ
ᴊᴀɴɴᴀʜ ɪs ᴍʏ ɢᴏᴀʟ