Any type of gambling is not permissible even in sports.
Prize money taken from the loser for the winner is not allowed.

Prize money donated by the organizers as a gift for the winner is allowed.

Entry fee tournaments is permissible.

Winner-take-all matches should not cause loss to the loser.

Wassalam.

Monopoly of food required by people is not allowed in Islam. If the items of food are not required in people daily life and keeping it in storage does not harm general public, then can be permissible but if keeping it is storage harms people in anyway, then it is not allowed at all.

Wassalam.

You must be sure that every glue or any other material is completely removed away from your body before performing Ghusl. If you see a bit of glue on any part of your bod after Ghusl, the Ghusl is invalid and you need to re do the Ghusl after removing it.

Wassalam.

Meat inside the dumpling is usually cooked by the heat of the cooking oil, that is why such oil touches the meat in direct or indirect way, so, if the meat was non Halal, the cooking oil will not remain Tahir.

Wassalam.

Cryptocurrency dealings are allowed according to some Maraaji’ like Ayatullah Zanjani who put two conditions: it should be according to the law of the country and should not harm anyone. There are different opinions in this matter. If you follow the verdict of the Marji’ who allows cryptocurrency dealings, there is no harm in leverage trading as far as it does not contain usury (RIBA).

Wassalam.

It is very clear in Islamic rules that any job which includes dealing with alcohol is forbidden and the income from it is unlawful (Haraam). The authentic  Hadeeth states that any one who deals with alcohol in any way will be cursed.

Wassalam.

Dancing is not permissible according to leading Maraaji’ of Taqleed. Dancing with music or with out music is included in this rule, Obviously, listening to sinful music is another sinful act.

Wassalam.

His son can pray next to him or behind him with intention of Furada prayer. If the father has the conditions of leading congregational prayer, son can pray behind his father with the intention of congregational prayer.

Wassalam.

Free will of every human being is a Quranic fact which can never be denied, Every human being is free to be a believer or a disbeliever, then all will meet the results of their own deeds and decisions. In Quran (We Have Guided him to the right way, then he decides whether to be a grateful or ungrateful. Sura 76, Verse 3.

The Knowledge of Allah (SWT) is unlimited and He Knows who will do what and when and where, but it never means forcing people to do wrong. Those who do wrong do it by their own decision and free will same those who do good. Allah (SWT) Helps doing good and never Helps doing bad.

Wassalam.

When tap water is used and the Najis item (A'yn al-Najasah) is removed then there is no question of impurity remains. Cat food by itself is not necessarily Najis unless it contains Najis ingradeint.

Wassalam.

Practicing sports and physical exercise which help our body and health is recommended as the Hadeeth states: Surely, your body has right on you إنَّ لِجَسَدِكَ  عليكَ حقّاً. Biharul Anwaar V.70, page 128.

Also (Surely, Allah Likes the strong person)إنَّ اللهَ يُحِبُّ الرجلَ القويّ. Biharul Anwaar , V.64, page  184.

Wassalam.