For writing on the computer on Shabat I depend on the Rema in the Shulchan Aruch that the prohibition of writing is Ashurit [and I would imagine also the ancient Hebrew letters called "Ketav Evri."]  along with the idea of the idea brought down on buildig that the form needs to be preserved for twenty four hours -not stored in megabytes.
But I admit there are perhaps many other areas in which I am too lenient. The truth is it is hard to get exactly how to keep the holy Torah. There are inherent ambiguities like honor of one's parents. It is hard to tell how far to take that.
 It is not just when one mitzvah seems to interfere with another. It is that sometimes the actual fulfillment is unclear.
I have written about the problems involved in keeping Torah quite a lot but not in a unified format. Mainly the problems come from the Sitra Achra {the Dark Side}which pretends to keep Torah in external form but internally is demonic. That makes trusting anything that the religious world says about Torah almost certainly wrong.

Some of the basic difficulties and ambiguities  are:
(1) The attitudes towards Reb Nachman, who was certainly a great tzadik, but when people get involved in Breslov they definitely get caught up into the Sitra Achra
(2) The ignoring of the signature of the Gra on the letter of excommunication. This is not simply ignored but outright declared wrong. To me it is clear that the Gra was 100% correct. [But that it would not apply to Reb Nachman for reasons that are easy to see if you read the actual letter itself.]
(3) The attitude towards the State of Israel. I would rather not go into this right now but service in the IDF and general support of Israel I consider very important.
(4) Attitudes towards what are called secular studies. To the Rambam there is no such thing as secular studies. Physics [in his terminology means also Chemistry] and Metaphysics are holy studies that are part of the Oral Law. Other things that are considered secular are simply treif, nevela, in the opinion of the Rambam.
(5) Attitudes towards kollel. This really is not that ambiguous in practice because you can pretty much tell whether people in any institution are using Torah to make money or if they are accepting money in order to learn Torah. If the later, then  clearly it is  great thing what they are doing.

(6)My own mistakes seem to be in the area of the Mir Yeshiva in NY. On one hand you might say it was important to get to Israel but that seems to have caused a lot of bitul Torah and getting involved in pretty dumb sitra achra stuff. What perhaps I might have done would have been to find  a Litvak kollel in Israel. But even that is hard to say could have made up for the loss of not learning in the Mir.