The Bible tells me to be still and know that He is God. Sometimes being still is a little harder than I think it is. Then knowing He is God while being still suggests I remove myself from the head of the table.
How do I be still? I usually sit down, close my eyes and lay my head back. I focus on slowing down my breathing so that it's even and rhythmic. Then I listen to the noises around me (I already have the television off or any other distractions). Someone once told me to quiet my mind by listening to what's going on around me. It's a very good suggestion for meditation.
What do I do to know that He is God? I imagine stories from the Old Testament where He showed Himself. With Adam and Eve in the garden; Abram and Sarah; Isaac and Rebekah; The Israelites and Moses, Aaron and Joshua going from Egypt into the Promised Land. Stories where God spoke directly to the prophets. Then in the New Testament when Mary was made with child and Jesus was born.
Knowing scripture is the only way to really be still and know that He is God. If you struggle with being still, you can meditate on God's word for comfort or whatever it is you need. If you want to know more about God, find a version of the Bible that is easy for you to understand and read it as little or as much as you can. Ask the Holy Spirit to make the Word come alive to you in meaning and in application.
If you haven't yet given your life to Jesus and have questions about what that means, ask your pastor or a Christian friend to help you.
