For ESL teachers or professors who have been searching for suitable ESL teaching resources, the best advice is to simply visit one's local bookstore. That, or simply search for English worksheets online.
There are distinct benefits to the resources available in both of
these contexts. Although the invention of the internet has created a 
new
degree of convenience and flexibility when searching for teaching
materials, there are still distinct advantages to visiting a bookstore
in person.
Bookstores allow teachers to browse and compare several textbooks, which can be very advantageous to teachers. It is not always necessary to purchase the books in the bookstore; rather, after finding the most suitable materials, teachers can then order these online, where it is often possible to find big discounts and sale prices. Moreover, it is possible to meet other teachers in bookstores or ask the staff about particular books and workbooks, which can be an added benefit. For repeat customers or those who own schools, many bookstores will offer loyalty cards, which enable the holder to receive a discount on large orders. For these reasons, bookstores are unlikely to be put out of business by their online competitors in the near future.
Online resources, however, can be accessed at any time, and many of these are free. Unlike bookstores, which close at a certain time, websites do not have closing hours, and ESL teachers can thus browse and download the resources online at their ease and convenience. Moreover, online bookstores often have a greater selection than actual brick and mortar bookstores, which can be useful to teachers looking to teach in a specific ESL niche or in a specific context.
Either way, it goes without saying that there is a plethora of useful and practical ESL materials that teachers can adapt into their classrooms as needed. Teachers are always looking for supplementary materials that they can use to add some spice to their classes, as classes must evolve and remain relevant to their students.
It is probably therefore best to incorporate a combination of established textbooks and additional worksheets or resources from various websites. In this way, teachers can ensure that their students will have a variety of resources and thus a variety of perspectives that they can use when learning English.
It is often said that variety is the spice of life; this is certainly true of the ESL teaching world, and teachers are thus advised to heed this adage when setting out to search for ESL teaching materials.
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