A Simple question you have asked, but the answer is not so simple. Basis is a very vast topic, there is no 1 to 10 points available. You have to read books and learn with your experience.
Though, I am mentioning some basic transactions to start with: SM50, SM51, AL08, SP01, SPAD, SMLG, ST03, ST06, ST07, ST04, SM12, SM13, RZ03, RZ04, RZ13, SE11, SE16, SCC4, SE06, SE09, SE01, SE10, SM36, SM37, SM39, SO01, ST11, AL11, SM49, SM69, SPAM, SAINT, SCOT, SM59, SU01, SU02, SU03, PFCG and so on…
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