Yahweh is Lord
When coming to know God, it is very important to understand what it means when it is said that He is "Lord."
The word "Lord" is an English word which originally meant one who watched over the loaf (of bread). He guarded that which was vital to the life of the people.
As it has come down through the ages, this English word has a meaning now of one in charge.
This meaning is very close to that of the original Hebrew. "Lord" in Hebrew is from the same root from which their word for "foundation" comes. It carries with it the idea of stability.
God, indeed, is stable—He holds the universe together. He works all things after his own will. He truly is Lord.
19Lord, hear. Lord, forgive. Lord, listen and do. Don’t defer, for your own sake, my God, because your city and your people are called by your name.” Daniel 9:19
19Arise, cry out in the night, at the beginning of the watches! Pour out your heart like water before the face of the Lord. Lift up your hands toward him for the life of your young children, who faint for hunger at the head of every street. Lamentations 2:19
12The wicked plots against the just, and gnashes at him with his teeth. 13The Lord will laugh at him, for he sees that his day is coming. Psalms 37:12,13
4He who sits in the heavens will laugh. The Lord will have them in derision. Psalms 2:4
23Wake up! Rise up to defend me, my God! My Lord, contend for me! Psalms 35:23
15For in you, Yahweh, do I hope. You will answer, Lord my God. Psalms 38:15
7Now, Lord, what do I wait for? My hope is in you. Psalms 39:7
15Lord, open my lips. My mouth shall declare your praise. Psalms 51:15
8I heard the Lord’s voice, saying, “Whom shall I send, and who will go for us?” Then I said, “Here I am. Send me!” Isaiah 6:8
17For Yahweh your God, he is God of gods, and Lord of lords, the great God, the mighty, and the awesome, who doesn’t respect persons, nor takes reward. Deuteronomy 10:17
The Father as Lord
Yahweh the Father is referred to as the Lord. Being the font of the Deity, from Whom the Son is begotten and from Whom the Holy Spirit emanates, He is the source of all the attributes of Deity.
His Son specifically refers to the Father as "Lord of heaven and earth."
25At that time, Jesus answered, “I thank you, Father, Lord of heaven and earth, that you hid these things from the wise and understanding, and revealed them to infants. Matthew 11:25
21In that same hour Jesus rejoiced in the Holy Spirit, and said, “I thank you, O Father, Lord of heaven and earth, that you have hidden these things from the wise and understanding, and revealed them to little children. Yes, Father, for so it was well-pleasing in your sight.” Luke 10:21
God the Father is protector and ruler of both heaven and earth. Being the Creator of all things, He rightly has rule over them.
24The God who made the world and all things in it, he, being Lord of heaven and earth, doesn’t dwell in temples made with hands, 25neither is he served by men’s hands, as though he needed anything, seeing he himself gives to all life and breath, and all things. Acts 17:24,25
The Son as Lord
Being the perfect representation of the Father, the Son likewise holds the title of Lord. Jesus, both as the Son of God, and the risen and glorified Son of Man, rules over all the affairs of creation, both in heaven and in earth.
18Jesus came to them and spoke to them, saying, “All authority has been given to me in heaven and on earth. Matthew 28:18
36“Let all the house of Israel therefore know certainly that God has made him both Lord and Christ, this Jesus whom you crucified.” Acts 2:36
Repeatedly throughout the writings of the New Covenant, Christ is called "Lord." He is the Master of heaven and earth, and the Master of all those who trust in Him. One day every knee will bow and every tongue will confess this truth (Philippians 2:8-11), but until then those who confess Him as Lord in this life will reap the harvest of a new and glorified body at His Return from heaven.
The Holy Spirit as Lord
The Spirit of Yahweh is called Lord, just as are the Father and Son.
17Now the Lord is the Spirit and where the Spirit of the Lord is, there is liberty. 18But we all, with unveiled face seeing the glory of the Lord as in a mirror, are transformed into the same image from glory to glory, even as from the Lord, the Spirit. 2 Corinthians 3:17,18
It is possible that Paul originally had "Yahweh" in mind here, where "Lord" stands in our copies of the Greek manuscripts (i.e., "now Yahweh is the Spirit and where the Spirit of Yahweh is...").
But it is also possible it specifically refers to Christ, as He is the One who stands between us and the Father. So when an Israeli turns to the Christ Jesus, the veil that has been covering his eyes will be removed. He will be able to see Him for Who He is.
Or, this could simply refer to the soverignty of the Holy Spirit; wherever He is, there is freedom. He is all-powerful and has control over the hearts of men. He is the One who transforms the children of God into the image they see in the mirror, that of Love incarnate: the Lord Jesus Christ.
The Holy Spirit, being Yahweh, is Lord.
Discerning Yahweh
Knowing that Yahweh is Lord should install peace into our hearts. As we come to see what He is like, we can rejoice that it is He Who is in charge.
Because He is Lord of all things, their Protector, we need not fear the many other impostors in this world.
We can discern Yahweh to be a compassionate Creator, a God Who has not disconnected His creation from Himself.
Rather, He takes such interest in pleasure in what He has made, including you, that He wants to be the covering protection for it all.