Thanks Toritoribe-san for your advice!
I am thinking of the following.
とfor unavoidable fact where the first part of the sentence whose verb or い-adjectives is always in dictionary form, だappends toな-adjective or noun before と. ない/くないand でない for the negative. The second part of the sentence is always in non-past form.
ても/でも for reverse condition having も following the て or で-form of verbs as appropriate and くて for the い-adjectives, でも after な-adjective or noun. なくて/くなくて and でなくて for the negative.
ば/なら whereう sound for verb in dictionary form changed to え sound followed with ば, い of い-adjective changed to ければ and ならgoes with な-adjective and noun. All the negative forms go with なければ .
たら where plain past form of verb or い-adjective goes beforeら, だったら after な-adjectives or nouns. Negative forms hasなかったら and くなかったら for verbs and い-adjectives respectively でなかったらafter な-adjective or noun.
tense in modifying clauses, temporal order between the subordinate and main clause, etc., etc. in textbooks
I had been through two set of textbooks, such as Genki and Elementary Japanese by Yoko Hasegawa, plus some educational web sites. I don't expect remember everything I had covered. I could even have misunderstood or not fully grasped everything. However I expect continual repetition and immersion will help me get there one day though it might take a long long while.
I would repeatedly review everything as I go wherever necessary but I'm not sure what tense in modifying clauses, temporal order between the subordinate and main clause you were referring to. Could you please give me some relevant Japanese words or grammar points for me to look up though they might be many? If it is a big ask, I would certainly appreciate at least the specific grammar point for the example sentence in question here. I thank you for your kind attention.