Connecting words

https://www.dlsweb.rmit.edu.au/lsu/content/4_writingskills/writing_tuts/linking_LL/linking3.html
http://writing.wisc.edu/Handbook/Transitions.html

http://www.englisch-hilfen.de/en/grammar/conjunctions.htm    (жишээ  / grammar )

http://www.smart-words.org/linking-words/

It is essential to understand how Linking Words, as a part of speech, can be used to combine ideas in writing - and thus ensure that ideas within sentences and paragraphs are elegantly connected - for the benefit of the reader. This will help to improve your writing (e.g. essay, comment, summary (scientific) review, (research) paper, letter, abstract, report, thesis, etc.). 
It is also fundamental to be aware of the sometimes subtle meaning of these "small" words within the English language.

http://education.wichita.edu/caduceus/examples/essay_student/transitions.htm

LINKING WORDS and PHRASES:
http://library.bcu.ac.uk/learner/writingguides/1.33.htm

You can use words or short phrases which help to guide your reader through your writing, and to link sentences, paragraphs and sections both forwards and backwards.Try to use a variety of expressions, particularly in longer pieces of writing.
The best way to "get a feel" for these words is through your reading. Most textbooks and articles are well-written and will probably include a lot of these cohesive devices. Note how they are used and try to emulate what you have read.

Listing	Giving examples	Generalising
first, second, third	for example	in general
first, furthermore, finally	for instance	generally
to begin, to conclude	as follows:	on the whole
next	that is	as a rule
Reinforcement	in this case	for the most part
also	namely	in most cases
furthermore	in other words	usually
moreover	Result/consequence	Highlighting
what is more	so	in particular
in addition	therefore	particularly
besides	as a result/consequence	especially
above all	accordingly	mainly
as well (as)	consequently	Reformulation
in the same way	because of this/that	in other words
not only ... but also	thus	rather
Similarity	hence	to put it more simply
equally	for this/that reason	Expressing an alternative
likewise	so that	alternatively
similarly	in that case	rather
correspondingly	under these circumstances	on the other hand
in the same way	Deduction	the alternative is
Transition to new point	then	another possibility would be
now,	in other words	Contrast
as far as x is concerned	in that case	instead
with regard/reference to	otherwise	conversely
as for ...	this implies that ...	on the contrary
it follows that	if so/not	in contrast
turning to	Stating the obvious	in comparison
Summary	obviously	Concession (sth unexpected)
in conclusion	clearly	however
to conclude	naturally	even though
in brief	of course	however much
to summarise	as can be expected	nevertheless
overall	surely	still
therefore	after all	yet