1) When saying Krias Shema [during the morning recital only ] it is proper [for men] to hold their Tzitzis in their left hand, between the pinky finger and the ring finger.
Even left handed people should grasp the Tzitzis with their left hand, as we want the Tzitzis to be near a person’s heart which is on the left side. (Psak of Rav Chaim Kanievsky Shlita) Married men should hold the Tzitzis of their Tallis, and not their Tallis Katan.
2) Some Poskim say to hold all 4 strands of Tzitzis (Kitzur Shulchan Aruch, Radvaz, and others). Other Poskim maintain that only the front 2 strands should be held, while the back two should remain where they are (Bais Yosef, Gaon of Vilna. See also Aruch HaShulchan)
The proper time to grasp the Tzitzis is during the Bracha of Ahavas Olam (for Nusach Sefard) or Ahava Rabbah (for Nusach Ashkenaz) when you reach the words " V’Havienu L’Shalom M’Arba Kanfos"
When starting to recite the third Parsha of Shema (VaYomer), which is the Parsha of Tziztis, it is proper to also grasp the Tzitzis with your right hand (without letting them go from your left hand) and gaze at them.
On Shabbos, is one allowed to construct temporary structures with legos or Magnetic toys such as magnetic balls and sticks?
My Answer:
Legos, or similar toys, whose pieces are temporarily put together, and do not involve screws or other similar fasteners that can be permanent, may be played with on shabbos according to most contemporary poskim (including Rav Chaim Pinchas Scheinberg Shlita, The Tzitz Eliezer Zatzal, and others)
Our holy sages, the Chazal tell us תנא דבי אליהו כל השונה הלכות בכל יום מובטח לו שהוא בן עולם הבא, שנאמר הליכות עולם לו, אל תקרי הליכות אלא הלכות
- one who studies [at least two] Halachos daily is assured a portion in Olam Haba - the world to come.
(:מגילה כ"ח )