A few generic beginner tips that will help you to get up to speed:
1: Never invest more than you can afford to loose.
2: Buy the dips (looks easy and is quite easy, if you can resist huge green candles / FOMO)
3: Begin with trading CMC top 25 coins, to avoid to much risk in the beginning.
4: To get the best average price for long term holds, apply dollar cost averaging (buy fixed amounts each weak, and buy a bit more in case of a sudden dip)
5: Bitcointalk, youtube and Google are your friends. View and read a lot about trading to get the hang of it.
6: Do your own research on a coin. never just jump in based on some social media hype.
Hope this helps a little.
This could be helpful. For me, i suggest that every newcommers should ask those who are expert in trading to avoid loses. In trading exchanges, i would sugget binance or coinmarketcap because of my experience to trade in this site. Maybe some sites are also good but the two i mentioned are my most convenient site in exchange.