There are many ways to design title tag what is the best method? 1.abc | abcd |abc 2.abc, abc, abc 3.abc-abc-abc 4.abc abc abc which one should I use?
use of - and | is to separate 2 or more then 2 titles and if you use abc, abc, abc or abc abc abc its mean its a long tail title
I like first one. Second one is stopping words, according to search engine is not worthy. Third one is no meaning in title.
Website title should always be in a sentence and in a "call to action" phrase. Don't use this tag to stuff keywords as much as you can, but make it more convincing for your visitors and for search engines by giving the exact title relevant to your web page content. Hope this helps.
No difference, the four method you listed are friendly to search engine, so which method should be used depends on your preference.
Take a look at popular site. Most probably they are using (1.abc | abcd |abc) Or (4.abc abc abc). From my point of view 1st is the best one.
I think it actually doesn't matter what title tag you use. till your website is properly optimized, it will not have any effect in ranking. But just be consistent in whatever form of title tag you use. All the pages should have a similar way of meta tags.
I would suggest to have a meaningful sentence type of formation this will really gain results for you. With sentence you can use "abc | abc | abc".