[header] How to find study material online [title] Decide what you are looking for. [step] Is it a book you want to download or just some kind of information on a particular topic or answer for a particular question? Your search query depends on what you need. [title] Search for what you need on a search engine. 
[step] Search results depend on the keywords you use in search query. [substeps] If you are looking for a pdf book, you can use the operator filetype: pdf along with your keywords.