1. There are many customs associated with this holiday, all of which are important and praiseworthy:
the most prevalent customs are Torah study on the night of Shavuot (‘Tikun Leyl Shavuot’), the custom of decorating the synagogue and homes with foliage and
consuming dairy foods and honey.
2. The custom to stay awake and to study/recite the ‘Tikun’ is important but it should not detract from the centrality of the next morning’s prayers:
every person should decide for himself or herself how they divide their energies.
3. Those who stay awake may eat and drink throughout the night with no restrictions until daybreak (03:47).
4. ‘Birkot Hashachar’ and ‘Netillat Yadayim’ for those who did not sleep at night:
the prevalent custom is to recite all ‘Birkot Hashachar’ and ‘Birkot HaTorah’. T
hose who are stringent will fulfill their obligation by hearing them recited by someone who slept through the night. 
The timing of the blessings: they should be recited just before Shacharit.
According to some opinions, ‘Birkot Hashachar’ should be recited after (halachic) midnight and ‘Birkot HaTorah’ after daybreak.
5. Reading Megillat Ruth – Sephardim and most Ashkenazim do not recite the blessing ‘Al Mikra Megillah’;
however, some Ashkenazim who follow the Gra are careful to read Ruth from a parchment scroll and to recite the blessings
of ‘Al Mikra Megillah’ and ‘Shehechiyanu’.
Sephardim and Yemenite Jews have the custom of reading Megillat Ruth before Mincha.
Ashkenazim read it before the reading of the Torah in Shacharit although some postpone its reading to right before Mincha to enable
those who stayed awake the night before to be more attentive to the reading.

6. On Isru Chag we do not recite ‘Tachanun’. This year it falls on Shabbat so we do not say ‘Av Harachamim’ or ‘Tzidkatcha Tzedek’.

7. We resume reciting ‘Tachanun’ in tefilla on Friday, 13 Sivan ( 5 June 20).