Always use miswak
Always do silat rahim with Sunnis
Never sleep after Fajr, start your day right after it
Do qaylula if you can
Be decisive - make decisions reasonably fast or within deadlines, with the information you have at the moment, stick to them, right or wrong, and take the consequences on the chin (non-deeni matters of life). Analysis paralysis and the ensuing inaction is a much greater calamity than doing something wrong and regretting it later. Your job is only to try your best. The rest is qadr and rizq, and life and death, and it is up to Allah. You simply can't and won't escape your destined qadr, rizq, illness/health, and death. (Age 8 and up)
Related to above - always read Salat Istikhara - even if only once and even if you see nothing in a dream to aid your decision making. Istikhara is more than just seeing positive or negative dreams on the matter. It is beseeching Allah for Divine Help and will ALWAYS work to your advantage, in ways you cannot imagine. (Ages 13 and up)
As a rule of thumb - rules of thumbs, first impressions, and gut feelings generally do work (non-deeni matters). People even go to the extent of saying they're inspirations from Allah. (Ages 13 & up)
Islam trumps all nationalism and culture including modern whitewashed Arab culture, as well as 'regular' desi culture, notwithstanding the liberal desi culture of the pakistanis or the hindu-Muslim bhai-bhai culture of the indians. A Nigerian or Indonesian Sunni Muslim is more important to you than a desi ismaili or qadiani or a rotten devbandi. (Age 2 and up). Political nationalism should have no place in your heart or home.
Never consider a semi-"hijabi" for marriage, especially if she's "career-oriented" and/or an expert on "the fiqh of my rights" and/or "loves the dawah scene". A down to earth but outright non-hijabi Muslim who just happens to work at the check-out counter at the supermarket and knows how to behave like a lady is a much lesser evil than such fitnah-mongering "hijabi dawah girls". (Age 10 and upwards, teach your son to be "judgmental", "biased", "quick to judge" towards all liberal Muslims, and to judgmentally look down upon kuffar, both male and female; at the same age, your daughter should be taught to be curt and straight forward in talking to Muslim men in the markets etc., and to look down upon kafir men as well as women, especially their men)
Stand up for authentic Shariah and staunchly oppose the "regular" desi culture in matters of purdah, marriage and family traditions etc., even if something is fi-nafsihi mibah. a lot of mufti sahiban do not want to invite the ire of the masses and will bring this point in (example, willingly giving daughters dowry), however that fi-nafsihi mibah thing will almost always lead to some or the other stupid hinduized ritual or hinduized fitnah or dalalah; or as we have seen in the case of indian Muslims, it has even granted them opportunities to meddle in our internal matters. there are not too many fi-nafsihi mibah cultural aspects of the subcontinent that are completely void of hindu influence. (even something as simple as agarbatti)
Present day naatkhwans are NOT your friends - NEITHER are peers - ONLY those ulama are who teach you Sunni aqidah and religious sciences, above and beyond the well known fazail, karamat, and wahabi-bashing.